2.1 Questions from the adversarial collaboration

2.2 The original recognition heuristic ®

The recognition heuristic has been generally defined as follows, in the universe of inferences (not preferences) and in the framework of paired comparison (two-alternative forced choice) tasks:

The heuristic has also been formally generalized to a model for inferences about N alternatives:

These rules sound like allsatz formulations (or universal statements). “If there are two objects, and you recognize just one of them, choose the recognized one, period.” They are deterministic and seem to imply a high level of generality. In my [OV] perception, it was this kind of supposed allsatz that was perceived as provocative by some researchers, and fueled their fervor to demonstrate that it does not hold under a number of conditions. However, the allsatz has not, or not always, been meant as such. It has been developed in a certain setting, within a specific mindset (see Gigerenzer & Goldstein, Reference Gigerenzer and Goldstein2011, p. 101). First, consider that the application of the recognition heuristic was considered useful only if it is empirically valid:

The question of strategy selection from an adaptive toolbox, which is a theoretical cornerstone of the simple heuristics program, has itself led to numerous debates. It has been a considerable problem up to now to answer how humans and other mammals decide if they should apply the recognition heuristic in a certain environment or not (see Hilbig & Richter, Reference Hilbig and Richter2011, and response by Brighton & Gigerenzer, Reference Brighton and Gigerenzer2011; see Marewski, Reference Marewski2010, and response by Glöckner & Betsch, Reference Glöckner and Betsch2010). For instance, as has been pointed out by many (e.g., B. R. Newell, Reference Newell2011), if the recognition heuristic aims to be a process model, it would also have to model exactly that, namely under which conditions it is fetched from the adaptive toolbox (see also Sections 2.4 and 3.4). Without a formal model for how to adaptively choose the heuristic in charge, the basic argument that a heuristic is applied if it matches the structure of the environment, that is, if it is successful, is circular. It has been argued that the triggers for applying the recognition heuristic can be both inherited and learned; for the recent development of a quantitative ecological model of strategy selection, the cognitive niche framework, see Marewski and Schooler (Reference Marewski and Schooler2011) and Section 3.4.

Beyond this point of adaptive application, there is another, much simpler point of contextual constraints. Originally there were three major articles defining the basic properties of the recognition heuristic. Two of them, Goldstein and Gigerenzer (Reference Goldstein, Gigerenzer, Gigerenzer and Todd1999, 2002), have the recognition heuristic in their title and exclusively focus on it. But there was an earlier Psychological Review paper, Gigerenzer and Goldstein (Reference Gigerenzer and Goldstein1996), which contains some important additional information and shows plainly in which context the recognition heuristic was created (or discovered). Gigerenzer and Goldstein (Reference Gigerenzer and Goldstein1996, p. 653) still speak of a recognition principle, which is a constitutive first building block of the take-the-best algorithm.Footnote ⁴ The authors state here:

Now this is an important point. This is the logical context in which the recognition heuristic, which received its name in journal print only three years later (Goldstein & Gigerenzer, Reference Goldstein, Gigerenzer, Gigerenzer and Todd1999), was devised. Gigerenzer and Goldstein (Reference Gigerenzer and Goldstein1996) make this point explicit, while the later papers (Goldstein & Gigerenzer, Reference Goldstein, Gigerenzer, Gigerenzer and Todd1999, 2002) are less clear on this. For instance, the word “givens” does not appear at all in the entire 2002 paper. While this inital restriction to inference from memory might seem trivial at first, it indeed has some eminent implications, especially concerning the plausibility of noncompensatory decision making.

Think about a person comparing two cities (the meanwhile classic task), one recognized by name, the other unrecognized. This person may well have further knowledge on the recognized city. However, if inference is entirely memory-based, it is implausible (if not logically impossible) that this person could have additional information about the city that she does not even recognize. So for the unrecognized city, this means that no further information whatsoever is available (see Section 2.3 for exceptions, and Section 3.1). Following Gigerenzer and Goldstein (Reference Gigerenzer and Goldstein1996), there cannot be any additional information about the unrecognized object, so there can also be no compensatory effects of positive information linked to the unrecognized object and favorably overruling the fact that it is unrecognized. “Thus, in inferences from memory, recognition is not like other cues. Rather, recognition can be seen as a prior condition for being able to recall further cue values from memory.” (Gigerenzer & Goldstein, Reference Gigerenzer and Goldstein2011, p. 107) Still, there can be additional cues available (from memory) for the recognized city, which may imply that it is rather small than large. This is why Goldstein and Gigerenzer (Reference Goldstein and Gigerenzer2002, p. 82 ff.) experimentally tested what happens if recognized + negatively predictive information meets unrecognized, showing that recognition typically still wins in their data, in line with the predicted noncompensatory property (resulting in “one-reason decision making”). While Oppenheimer (Reference Oppenheimer2003) experimentally demonstrated that knowledge about cities being small can well overrule recognition effects,Footnote ⁵ Gigerenzer and Goldstein (Reference Gigerenzer and Goldstein2011, p. 107) counter, in line with their earlier probabilistic mental model theory of inference (Gigerenzer, Hoffrage, & Kleinbölting, Reference Gigerenzer, Hoffrage and Kleinbölting1991), that this is not inference about the city size anymore, but plain knowledge—their “Misunderstanding # 2”. See Section 2.5 for further debate on this.

So that’s why, as it seems. The supposed allsatz was not an exuberant product of German idealism in the Hegelian tradition, but indeed a specifically limited “non-allsatz under constraints”. What Gigerenzer and Goldstein originally had in mind was a very precisely (and narrowly, see below) defined set of cases. This is why B. R. Newell and Fernandez (Reference Newell and Fernandez2006, Experiment 1) and Glöckner and Bröder (Reference Glöckner and Bröder2011), both introducing additional knowledge for the unrecognized object, are not accepted as evidence against the recognition heuristic by Gigerenzer and Goldstein (Reference Gigerenzer and Goldstein2011)—their “Misunderstanding # 3”. The same refutation would hold for Zdrahal-Urbanek & Vitouch (Reference Zdrahal-Urbanek, Vitouch, Gula, Alexandrowicz, Strauß, Brunner, Jenull-Schiefer and Vitouch2006, Exp. 1). See also Pohl (Reference Pohl2011) for facets of this givens debate, and Pachur, Bröder, and Marewski (Reference Pachur, Bröder and Marewski2008) for an overview of published work.

Tightly sticking to the original contextual definition of the recognition heuristic has an advantage and a flipside. The advantage is that the predictive accuracy of the recognition heuristic is high, then: It often seems to very accurately describe what people actually do. The flipside, however, playing the devil’s advocate here, is that there may not be too many scenarios indeed apart from quiz shows and (badly prepared) school exams where people have to make merely recognition-based inferential decisions in the original sense (see the real-world considerations in Hauser, Reference Hauser2011). So, strictly limiting the recognition heuristic to cases without any givens makes the story more accurate, maybe even water-tight, but also less bold in scope. What shall people possibly do if they have to decide between a recognized and an unrecognized object, and they cannot get any (more) information about the unrecognized option? They can essentially (a) guess, (b) choose the recognized one, or (c) gamble by choosing the unrecognized one in case the recognized one is supposed or known to have negatively predictive cue values. All the work on the recognition heuristic then “only” shows that people do (b) far more often than (a) or (c). It is not so much the case here that available information would be ignored (as with other heuristics from the simple heuristics program): There is just nothing available for the unrecognized object for possible comparative integration, compensation, or trade-off, because we know plainly nothing about it.Footnote ⁶ There still remain some quite remarkable effects, such as the less-is-more effect (within this special issue, see Beaman et al., Reference Beaman, Smith, Frosch and McCloy2010; Davis-Stober et al., Reference Davis-Stober, Dana and Budescu2010; Katsikopoulos, Reference Katsikopoulos2010; Smithson, Reference Smithson2010); and it is always easy to brag in hindsight that something ain’t spectacular because we knew it all along. But you may agree that the original 1996 setting narrows down the scope, and makes the recognition heuristic somewhat less thrilling, bold, and provocative—less “think big”.

Does this mean that all the brouhaha about the perceived allsatz was in vain, because the critics just didn’t understand the proper definition of the recognition heuristic, and did not read the papers right (or did not read the right papers)? Was it basically all due to a spreading givens fallacy? Well, not so fast (and not so frugal). Of course, nobody doubts that definitions are important. (For the debate on what has been defined when, and how clearly and visibly, see above.) But there is no unconditional copyright in science to what a heuristic is, once and for all, and under which (realistic) conditions it is tested. We are all aiming to arrive at meaningful statements about decision making in the wild, after all (see Section 3.5). If the recognition heuristic is limited in the original way (i.e., in the Gigerenzer & Goldstein, Reference Gigerenzer and Goldstein1996, way), then it is no model for all those situations where unrecognized objects are presented together with additional information (as in brochures etc.), or where additional information can be easily obtained or is readily delivered, which are realistic and interesting scenarios, too. It makes excellent sense to extend the idea that recognition is used as a cue that guides decisions to other contexts and domains, and see what role recognition plays when other cues (not from memory) are around. It is still not a settled question if recognition is just “one cue among others” in such conceptually extended settings, or if there is a certain primacy to the recognition cue (sometimes, for some persons, under some conditions) as well. For instance, just think about the fruitful recent extensions into the realm of preferences (e.g., Gigerenzer & Goldstein, Reference Gigerenzer and Goldstein2011, p. 113 ff.; Hauser, Reference Hauser2011; Oeusoonthornwattana & Shanks, Reference Oeusoonthornwattana and Shanks2010).

So the role of the recognition cue in combination with givens is neither uninteresting nor unimportant. There are many scenarios where a decision has to be made between two options with one recognized and the other unrecognized (e.g., stocks of companies), and additional information is provided, or can be searched for, or can be purchased at some monetary or non-monetary cost. Consider, for instance, Exp. 1 in B. R. Newell and Shanks (Reference Newell and Shanks2004), where participants often purchased additional information, and the studies by Ayton et al. (Reference Ayton, Önkal and McReynolds2011), or Zdrahal-Urbanek (Reference Zdrahal-Urbanek2004; Zdrahal-Urbanek & Vitouch, Reference Zdrahal-Urbanek, Vitouch, Gula, Alexandrowicz, Strauß, Brunner, Jenull-Schiefer and Vitouch2006). Especially in the “Age of Google”, one may assume that many people would prefer to accumulate some information about unrecognized objects as soon as the decision is important, and there is five minutes time. The question, then, is which role the initial non-recognition plays in exactly that scenario, and if it can override other credible information. As Gigerenzer and Goldstein (Reference Gigerenzer and Goldstein2011, p. 101) state themselves:

In their conclusion, the creators give an extended picture of the recognition heuristic themselves:

Having said all this, a word of caution and a joint prospect should be added. Looking back, we all should care not to fall prey to a specific pattern of conceptual defense: that evidence against the recognition heuristic (especially against its strictly noncompensatory nature) is rebuffed with the argument that it is not the original recognition heuristic that has been tested, while evidence in favor of it is welcome also from innovative contexts quite remote from the original definition (e.g., Berg, Hoffrage, & Abramczuk, Reference Berg, Hoffrage and Abramczuk2010). Similar caveats against partisan interpretation of evidence hold for the critics: While the identification of potential loopholes in a theory is important, it may be a better choice to help close the loophole than to shoot the theory. Prospectively, as a common goal, we should just arrive at a more relaxed attitude (including our assumptions), not quarreling about originals and who-said-what at which time, but instead extending the framework and describing which variants of recognition-based heuristics hold under which conditions (see Section 3.1). Or to say it with Abraham Lincoln (see Hauser, Reference Hauser2011): Probably we can show that all of the people use recognition-based heuristics some of the time, and we can even show that most of the people almost always use them under some conditions (namely those of Gigerenzer & Goldstein, Reference Gigerenzer and Goldstein1996), but we cannot show that all of the people use them under all conditions, all of the time. Research would profit from such a common effort.

2.3 What’s in a name?

This section briefly digresses into a setting where even less information seems to be in the game than with the original case for the recognition heuristic. Imagine you are confronted with the names of two German cities, and you recognize neither of them. There is no more information available to infer which city is larger. What can you do?

Gigerenzer and Goldstein (Reference Gigerenzer and Goldstein2011, p. 107) coherently write that “[i]f one has not heard of an object, its cue values cannot be recalled from memory (although the name itself may, quite rarely, impart cue values, much like ‘80 proof whiskey’ reveals its alcohol content).” But are these cases so rare indeed? In 2000, Melanie Drösemeyer, a German psychology student at the University of Münster, finished her yet unpublished master’s thesis. From her supervisor, Wolfgang Hell, I [OV] recently learned that Drösemeyer (Reference Drösemeier2000) discovered an intriguing effect about how people can use the length of a city’s name to infer its size (W. Hell, personal e-communication, August 30^th, 2010). We might baptize this the brevity cue.

The theoretical rationale is as follows: There is an old tenet in linguistics that words and names get shorter over long periods of time with frequent use. For instance, Schleicher (Reference Schleicher1860; cited from Deutscher, Reference Deutscher2011) famously compared the Gothic verb form habaidedeima with its modern English relative, the monosyllabic had, “and linkened the modern form to a statue that has been rolling around on a riverbed and whose limbs have been worn away, so that hardly anything remains but a polished stone cylinder” (Deutscher, Reference Deutscher2011, p. 114). “Omnibus”, already a brevium itself, meaning “for all” in Latin, becomes “bus”, “Vindobona” becomes “Wien” (“Vienna”), “Colonia Agrippina” becomes “Köln” (but as a foreigner, you can take the time to say “Cologne”). Although it is easy to come up with counterexamples (large cities with long names), the correlation seems to be considered an established fact in linguistics.

Drösemeyer (Reference Drösemeier2000) and Hell used the names of smaller German cities, between 45.000 and 60.000 and between 20.000 and 25.000 inhabitants. This resulted in their German participants sometimes having heard of neither of the two, and sometimes just recognizing the two by name, but with no further information available from memory. In the former case, participants correctly chose the larger city in 55% of the pairs, in the latter in 54% of the pairs, both rates significantly different from chance. Although these effects are tiny, they point to an interesting exploitation of information from the mere names, even if both cities are unrecognized.Footnote ⁷

But there is more. When they asked the subjects about their strategies (and computed the respective ecological validities for their sample of cities), Drösemeyer and Hell found that 19 out of 40 subjects introspectively reported the heuristic “the longer the name, the smaller the city” (with not a single one stating the opposite). So which Austrian city is larger, Graz or Klosterneuburg? You name it. Other cues revealed were that cities with the endings “-stadt” and “-hafen” tend to be large (true for -hafen, indifferent for -stadt), and that the endings -heim / -dorf / -berg / -hausen / -ingen / -bach are characteristic for small cities (true for all six). Participants were divided, however, if “Bad” (spa) before the name was a positive or a negative predictor (it was indifferent), and 9 out of 40 were wrong in assuming that appendices such as “auf der Höhe”, “an der Wümme” or “am Rübenberge” (usually used for discriminating between cities of the same name) signify a smaller city, because these actually tended to be larger.

There may be similar, and probably larger, effects if samples with cities from different world regions are used, since the geographic location deduced from the name (e.g., East-Asian vs. Swedish) may allow valid inferences on city sizes. Although the effects reported so far are small and await replication, note that such information usage permits inferences where the recognition heuristic assumes guessing: both cities unrecognized or both cities recognized, no further information retrievable. A similar, much better established strategy is the fluency heuristic (Hertwig, Herzog, Schooler, & Reimer, Reference Hertwig, Herzog, Schooler and Reimer2008; Marewski & Schooler, Reference Marewski and Schooler2011; Schooler & Hertwig, Reference Schooler and Hertwig2005; for a critical view see Hilbig, Erdfelder, & Pohl, Reference Hilbig, Erdfelder and Pohl2011), which holds that people introspectively use the recognition memory retrieval times of two recognized city names for inferring that the one that is perceived as having the longer retrieval time is smaller. In sum, there seems to be an entire quiver of cues—fluency, brevity, suffixes, region cues, and the like—, some of them domain-specific, that can jump in instead of guessing in cases which the recognition heuristic cannot decide.

2.4 A probabilistic revolution?

An eye-catching property of the recognition heuristic is its deterministic formulation—see the allsatz considerations in Section 2.2. There is indeed evidence that the recognition heuristic may, under many circumstances and in both its original version and some extended versions, be the single best simple deterministic model available. However, it is an evident question if a probabilistic version of the recognition heuristic, and of other simple heuristics, would not be a more appropriate descriptor of both the nature and the actual outcome of mammalian/human decision processes.Footnote ⁸

In the words of the English statistician Maurice Kendall, at the time of WWII, his probabilistic ilk had “already overrun every branch of science with a rapidity of conquest rivaled only by Attila, Mohammed, and the Colorado beetle” (Kendall, Reference Kendall1942, p. 69; cited from Gigerenzer, Reference Gigerenzer, Keren and Lewis1993, p. 311). As vividly pictured by Kendall’s dictum, this “probabilistic revolution in science” (e.g., Gigerenzer et al., Reference Gigerenzer, Swijtink, Porter, Daston, Beatty and Krüger1989) stopped at nothing. Among the most illustrative examples in psychology is Skinner’s theory of operant conditioning, or reinforcement learning, which was transformed into a probabilistic theory of learning by Estes (Reference Estes and Koch1959). Should the probabilistic revolution come to a late halt, after all, at simple heuristics? It is not easy to see why “probabilistic mental models” (Gigerenzer et al., Reference Gigerenzer, Hoffrage and Kleinbölting1991), as the precursors of simple heuristics were called, must suffer a deterministic process description.

Of course, there are several ways to go probabilistic. If the recognition heuristic per se is not understood as a cognitive process model, but initially just as a stylized algorithm or abstract rule, prescribing a certain decision routine, then it need not be probabilistic as such. (“Assume there is this rule, among several; who uses it under which circumstances, and how often, is another issue.”) In this case, there subsequently should be a corresponding probabilistic process model, descriptively based on the relative frequency of the heuristic’s actual application by real decision makers. However, there is evidence that the recognition heuristic has been designed as a process model (see Section 3.2 in Pohl, Reference Pohl2011), or at least with the intention to be easily transducible into a process model.Footnote ⁹ On general grounds, such a process model should fit reality better, and gain generality, if it were probabilistic. (For recent implementations of process models of recognition-based inference, including the recognition heuristic and various compensatory models that assume probabilistic processes, see Marewski & Mehlhorn, in press.)

This topic is linked to a more general as-if problem in judgment and decision making research, namely the monotony or uniformity assumption. Researchers often act as if it were granted that their participants apply the same decision routine in every single trial, without any strategy variation at all. This is usually due to methodical constraints, making models only identifiable under this assumption. However, there are several evolution-based arguments for why strategy variation is not only real, but also rational: (A) Environments may change without notice; (B) a certain share of exploration may be advantageous even if one thinks to have adopted the optimal, or a very good, strategy; and (C) uniform behavior can be most easily (and, in the worst case, most deadly) exploited by opponents in game-theoretical settings. Argument C relates to the evolutionist case for protean behavior (adaptively unpredictable behavior; e.g., Miller, Reference Miller, Whiten and Byrne1997), which makes the next move unpredictable even for the protagonist himself, and therefore also for a predator or competitor. Having said this, while both the reasons for strategy variation and its actual benefits may contextually vary, its mere existence should be beyond question: See, for instance, Pachur’s (2011) conclusion from the data of Pachur and Hertwig (Reference Pachur and Hertwig2006) suggesting that “the decision of whether to use the recognition heuristic or not is made for each individual pair of objects rather than for an entire environment” (Pachur, Reference Pachur2011, p. 418). For recent methodological attempts to tackle this problem, see Marewski and Mehlhorn (in press) and Marewski and Schooler (Reference Marewski and Schooler2011).

Finally, it has repeatedly been argued that the recognition heuristic is not really a (satisfying) process model (e.g., B. R. Newell, Reference Newell2011), because if it were, it had to include steps for deciding whether the heuristic should be applied in a given setting. Hence, an accurate process model had to contain more information than just the recognition/non-recognition information. As considered in this editorial, further bits of information may play a decisive role within a typical recognition setup, too. Figure 1 aims to give an extended flow-chart model of recognition-related decision processes, trying to integrate several facets discussed in this triple special issue, some of them hypothetical, into one graphic display. The chart has, due to the nature of the subject, some core parallels to Figure 1 from Pohl (Reference Pohl2011), but tries to further expand his model.

Figure 1 [OV and RFP]: Extended recognition heuristic process model. Setting: Pair of objects (forced choice); all cues retrieved from memory (but object names given). The sketched decision flow includes both an evaluation step (“Is recognition a valid cue in this domain and/or with this specific pair of objects?”) and specific knowledge states (e.g., perceived retrieval fluency; cue knowledge and use) of the individual decision maker. The dashed area depicts the evaluation stage. Note that the chosen sequence of steps is largely speculative, and not intended to exclude modes of parallel processing. TTB = take-the-best heuristic.

2.5 Synopsis: From psychophysics to metaphysics—and beyond

The recognition heuristic, as initially postulated, seemed to have an almost psychophysical quality: It had the simplicity and determinism of a classic psychological law, just as from the dusk of the 19^th century, from the days of Fechner, Ebbinghaus, and Wundt. What followed was a longsome debate on whether the cognitive world could be so physicalistically simple. As typical for such debates, it was difficult in the long run to completely abstain from metaphysics. For instance, Gigerenzer and Goldstein (Reference Gigerenzer and Goldstein2011), in their “Misunderstanding # 2”, hold that “(direct) knowledge” essentially differs from cue-based inference. However, the example they provide is that we all know that Bernie Madoff is a fraudulent bankrupt. But do we indeed know this, in a way that would have halfway satisfied the British Empiricists, or do we infer it from statements in the media of our choice (which are rather cues than stone-carved facts)? The border between secure knowledge and probabilistic inference is a foggy site (see the section “Cues, information & knowledge” in B. R. Newell, Reference Newell2011). Consider that Goldstein and Gigerenzer (Reference Goldstein and Gigerenzer2002, p. 76) stated themselves that “It is also easy to think of instances in which an object may be recognized for having a small criterion value. Yet even in such cases the recognition heuristic still predicts that a recognized object will be chosen over an unrecognized object”, which does not properly fit to their segregation of inference and “local” knowledge.

On a hopefully more material level, it is a general question if recognition and valence can be essentially separated. From an evolutionary perspective, a major function of recognition should be to guide one’s behavior towards either approaching (if recognized as positive/pleasant) or avoiding (if recognized as negative/aversive) the recognized entity. So recognition memory without memory for valence seems rather one-eyed. One of the major theories of human emotion and affect, the component process model (CPM; Scherer, Reference Scherer1987, 2001, 2009), assumes a dynamic sequence of stimulus evaluation checks, with the earliest checks being automatically processed. Step 1, the novelty check (known/unknown), is immediately followed by a valence check (“intrinsic pleasantness”) in Step 2. While it seems to make adaptive sense to have valence intimately coupled to recognition, to attach a “valence label” to things you have encountered before and therefore recognize, novelty and valence appraisals indeed seem to happen with distinct, sequential timelines (Delplanque et al., Reference Delplanque, Grandjean, Chrea, Coppin, Aymard, Cayeux, Margot, Velazco, Sander and Scherer2009), with novelty being processed as soon as 100 ms after stimulus presentation with olfactory stimuli and valence being processed at a latency of 400 to 500 ms. Zdrahal-Urbanek and Vitouch (Reference Zdrahal-Urbanek, Vitouch, Gula, Alexandrowicz, Strauß, Brunner, Jenull-Schiefer and Vitouch2006) found that most participants would not give virtual votes to populist right-wing politicians from foreign European countries, and would not erroneously take them for the prime ministers, even if these are the only ones they recognize due to international media publicity; so recognition and valence memory usually seem to inseparably go along.Footnote ¹⁰

In a nutshell, assumptions from the fast and frugal heuristics program have sometimes been perceived as apodictic by skeptics of central tenets of the approach. On the creators’ side, critique has been perceived as being based on misreadings and misconceptions. What is hors de question in any case, and admirable as even the most inveterate critics must admit, is the amount of creative research that has been inspired and triggered by this program, and especially by the recognition heuristic.

Taking all evidence together, recognition effects seem to play an important role in everyday decision making, in a variety of settings, and with both inferences and preferences. Just think of the famous pick-up scene in Vicky Cristina Barcelona, where Javier Bardem approaches the table of Rebecca Hall (Vicky) and Scarlett Johansson (Cristina) and forthrightly suggests that the three of them fly to Oviedo in one hour, see a sculpture, spend the weekend, and make love together. “I’m not going to Oviedo. First off, I never heard of Oviedo”: Name recognition is the first cue that Vicky produces, then supported by two further arguments. (Well, they eventually do go to Oviedo, but that’s another story.) In this fine emblematic case of applied dyadic decision-making under considerable uncertainty, Woody Allen seems to have gotten the cognitive basics quite right.

3.1 Build cumulative theories

Recently, Katsikopoulos & Lan (submitted) pointed to our adversarial collaboration as an illustration of how researchers coming from different theoretical perspectives are sometimes classified as “proponents” or “critics” of a certain approach. In their view, such divisions are harmful for theory integration, as they give importance to who said what instead of what has originally been said. We agree. Recognition heuristic research should be about data and models, and not about people.

We would like to add another point to Katsikopoulos and Lan’s (submitted) observation. As editors, it has been a striking experience for us to actually learn how much of the recognition heuristic controversy focuses on what has originally been said about the recognition heuristic. For instance, as pointed out in Section 2.2, in 1996, Gigerenzer and Goldstein introduced the recognition principle as a mechanism for making decisions when all available information has been retrieved from memory. They labeled the corresponding paradigm inferences from memory. The recognition principle was later renamed into the recognition heuristic (Goldstein & Gigerenzer, Reference Goldstein, Gigerenzer, Gigerenzer and Todd1999, 2002). Even though the recognition heuristic’s memory-based paradigm had thus been specified,Footnote ¹¹ as we have witnessed, a part of the current controversies still centers on whether the recognition heuristic has originally been specified as a model for inferences from memory, or whether this heuristic is additionally applicable to non-memory-based paradigms. This has been an important distinction, for instance, (a) to those researchers who have set out to test and potentially refute the recognition heuristic as a model of behavior, or (b) to those researchers who were interested in establishing what are likely to represent fair and/or strong tests of the heuristic, or (c) to those researchers whose goal it was to evaluate whether the results of memory-based tests of this heuristic are likely to generalize to non-memory-based settings.

Importantly, from our perspective it is neither useful nor relevant how the domain of the recognition heuristic has originally been specified more than a decade ago. After all, scientific theories evolve over time, and change in the course of their development in order to be able to account for empirical findings. This process is called cumulative theory development. By this token, it is more of historical importance whether the recognition heuristic was originally specified only as a model for memory-based inferences or whether the intended applicability of the model exceeded that domain; what is relevant is the fact that the current empirical evidence suggests that the recognition heuristic is a good model of behavior for inferences from memory. That is, in our view, current theorizing about the recognition heuristic specifies this heuristic as a model of memory-based inference, and contemporary research should start from there, rather than focus on producing yet another test of this heuristic that establishes the heuristic to be an inadequate model of behavior outside of its domain. For instance, as we will elaborate in Section 3.4 below, it is important that contemporary recognition heuristic research continues to explore the boundary conditions of recognition heuristic use in inferences from memory (e.g., Pachur & Hertwig, Reference Pachur and Hertwig2006; Pohl, Reference Pohl2006), ideally specifying corresponding computational models that allow predicting when people are likely to rely on the heuristic in memory-based inference and when not. Much the same—quarrelling about what additional assumptions about the recognition heuristic have been specified, and what not—can be said with respect to other controversies that populate the recognition heuristic literature (see Pohl, Reference Pohl2011).

In short, rather than being largely motivated by what has originally been said about the recognition heuristic, studies on this model of behavior should draw their motivation from refining the current knowledge and theorizing about recognition-based inference.

3.2 Build computational process models, using cognitive architectures

Where does the focus on who has said what, and what has been said come from? We wonder if a part of the problem can be attributed to the following observation: While much of the rather uncontroversial recognition heuristic research that focuses on prescriptive, normative questions or the less-is-more effect makes use of formal methods such as mathematical or simulation-based modeling (e.g., Davis-Stober et al., Reference Davis-Stober, Dana and Budescu2010; Katsikopoulos, Reference Katsikopoulos2010; Pachur, Reference Pachur2010; Pleskac, Reference Pleskac2007; Reimer & Katsikopoulos, Reference Reimer and Katsikopoulos2004; Schooler & Hertwig, Reference Schooler and Hertwig2005; Smithson, Reference Smithson2010), most descriptive and more controversial studies on this heuristic have not made use of corresponding tools. Formal simulation and mathematical methods can help dissolving ambiguities in theory specification. For instance, ideally, the entire recognition heuristic theory were cast into computer code, and this code would also specify when the heuristic ought to be able to describe people’s behavior, say in memory-based inferences, and when not. If the code were applied to experimental paradigms for which it has not been designed it would, ideally, be unlikely to run, obliterating the need to exchange unfruitful arguments about how the model had originally been specified. At the same time, for those interested in the historical stages of theory development, changes in the code, made to accommodate new findings or to extend the recognition heuristic’s domain of applicability to new experimental paradigms, can be detected by comparing older and newer model codes.

Besides helping to avoid unfruitful controversies, formal simulation and mathematical approaches can also aid ameliorating a more serious problem most descriptive studies on the recognition heuristic have suffered from: As mentioned above, this heuristic represents a model of how people make inferences when all available information has to be retrieved from memory. Memory processes, such as whether an object (e.g., a car brand) is recognized or not, provide input to the heuristic’s decision rule (i.e., to infer recognized objects to be larger than unrecognized ones). While memory processes thus obviously play a role in the way how people make recognition-based inferences, other cognitive processes are also likely to be involved in the use of the recognition heuristic. These include, for instance, perceptual processes (e.g., reading a car brand’s name), intentional processes (e.g., having the intention to make inferences about car quality quickly rather than accurately), motor processes (e.g., pressing a key in a computer-based consumer choice experiment), as well as the interplay of these processes with the environment (e.g., which car brand names are advertised in the environment and hence ready to be memorized) to name just a few.

It has been pointed out elsewhere why it is important for a theory to provide an integrative, encompassing account of the various aspects of behavior (see A. Newell, Reference Newell1990), and why also contemporary behavioral recognition heuristic research warrants such an integrative, encompassing approach (see Dougherty et al., Reference Dougherty, Franco-Watkins and Thomas2008; Tomlinson et al., Reference Tomlinson, Marewski and Dougherty2011). Rather than repeating the arguments that have been made, we would like to point to one tool that is available for building such an approach: cognitive architectures. A cognitive architecture is a quantitative theory that applies to a broad array of behaviors and tasks, formally integrating theories of memory, perception, action, and other aspects of cognition (for an introduction to cognitive architecture, see Gluck, Reference Gluck, Salas and Maurino2010). Implementation of models within a cognitive architecture lends further precision and breadth to the corresponding theory. For instance, it is possible to specify when the recognition heuristic will be used by people and when not, say, in memory-based inferences about city size or spatial navigation in driving.

Among the architectures developed to date (e.g., EPIC, Meyer & Kieras, Reference Meyer and Kieras1997; Soar, A. Newell, Reference Newell1992), the ACT-R cognitive architecture (e.g., Anderson, et al., Reference Anderson, Bothell, Byrne, Douglass, Lebiere and Qin2004) provides perhaps the most detailed account of the various perceptual, memory, and decision processes that may play a role in recognition-based inference, making ACT-R especially suitable to study the recognition heuristic. At the same time, ACT-R is sufficiently broad to allow for modeling recognition-based decision processes beyond the two-alternative forced choice task that has been the focus of most studies on the recognition heuristic. To illustrate this, ACT-R has been applied to flying (Gluck, Ball, & Krusmark, Reference Gluck, Ball, Krusmark and Gray2007), driving (Salvucci, Reference Salvucci2006), or the teaching of thousands of children in U.S. high schools (Ritter, Anderson, Koedinger, & Corbett, Reference Ritter, Anderson, Koedinger and Corbett2007).Footnote ¹² Specifically, ACT-R consists of a set of modules, each of which is devoted to a different activity. For example, the declarative module allows information storage in and retrieval from declarative memory (e.g., whether a city is recognized or not, what a person knows about a city), the intentional module keeps track of a person’s goals (e.g., infer city size), and the imaginal module holds information necessary to solve the problem currently in the focus of attention. A visual module for perception and a manual module for motor actions (e.g., pressing a key on a computer keyboard) are used to simulate interactions with the world. These modules are coordinated by a production system. The production system consists of production rules (i.e., if-then rules) that serve to model procedural knowledge (i.e., knowing how), and that allow implementing decision making mechanisms such as the recognition heuristic.

With ACT-R researchers can derive predictions of at least three kinds of behavioral data: (i) overt behavior, such as the outcomes of decisions; (ii) the temporal aspects of the behavior, such as time involved in making a decision; and (iii) the associated patterns of neuronal activity in the brain, as measured with functional magnetic resonance imaging (fMRI) scanners. For instance, by modeling decision processes side by side with perceptual, memory, intentional, and motor processes, Marewski and Mehlhorn (in press) were able to test 39 detailed competing quantitative predictions about people’s decisions and the associated decision times in recognition-based inferences from memory. The corresponding models not only predict which of two objects will be chosen, but also how different pieces of information will be processed to derive a decision. In doing so, the models quantitatively predict at what point in time which processes (e.g., memory, decision, motor, etc.) occur in parallel and which do not. In the memory paradigm, it seems difficult to derive such detailed predictions without a formal, architectural approach.

Until today, only a few studies have investigated the recognition heuristic by specifying this model within a cognitive architecture, or a similarly formalized, architectural system. Most of these studies do not actually test the heuristic as a model of behavior (e.g., Dougherty et al., Reference Dougherty, Franco-Watkins and Thomas2008; Gigerenzer, Hoffrage, & Goldstein, Reference Gigerenzer, Hoffrage and Goldstein2008; Pachur, Reference Pachur2010; Schooler & Hertwig, Reference Schooler and Hertwig2005; for such tests see Marewski & Mehlhorn, in press; Marewski & Schooler, Reference Marewski and Schooler2011; see also Glöckner & Bröder, Reference Glöckner and Bröder2011, for a formal test conducted without specifying the heuristic in a cognitive architecture). Put differently, the architectural modeling of recognition-based inference still represents a largely unexplored territory.

We can think of at least three reasons for this state of affairs. A first reason is perhaps that one appeal of studying the recognition heuristic, namely its stunning simplicity, appears to get lost when embedding this simple mechanism in a detailed cognitive framework (see Pohl, Reference Pohl2011, for corresponding arguments). Yet, it is not necessarily the recognition heuristic that becomes more complex when implemented in a cognitive architecture; rather it is the case that studying even simple decision making mechanisms warrants formulating detailed theories about how these simple mechanisms interact with other components of cognition.Footnote ¹³ A second reason, is perhaps, disciplinary segregation: A portion of decision making research continues to be mostly concerned with formulating verbal, that is, informal hypotheses about cognition, ignoring the formal tools that have been developed by mathematical psychologists, computer scientists, and machine learning and artificial intelligence researchers, to name a few. A third reason may actually be a product of the second one: If precision and level of detail is a major virtue of architectural approaches to cognition, these features can also become a curse. With respect to much of the verbal, informal contemporary recognition heuristic theorizing (e.g., Hilbig, Scholl, & Pohl, Reference Hilbig, Scholl and Pohl2010; Marewski, Gaissmaier, Schooler, et al., Reference Marewski, Gaissmaier, Schooler, Goldstein, Gigerenzer, Taatgen and van Rijn2009; Newell & Fernandez, Reference Newell and Fernandez2006; Pachur et al., Reference Pachur, Bröder and Marewski2008; Pohl, Reference Pohl2006; Volz et al., Reference Volz, Schooler, Schubotz, Raab, Gigerenzer and Cramon2006) modelers need to decide how to bridge the gaps between informal verbal descriptions of hypotheses and their respective architectural implementations. If it is not clear a priori which of many potential formal implementations of a verbal hypothesis are adequate, a large proliferation of formal implementations can be the result, warranting large-scale (and hence labor-intensive) competitive tests of these implementations in order to identify the best one. For instance, when modeling recognition-based inferences with ACT-R, Marewski and Mehlhorn (in press) faced this problem, leading them to implement a total of 39 different quantitative models of recognition-based inference in ACT-R.Footnote ¹⁴ Another problem modelers face is that bridging the gap between verbal, informal hypotheses and their architectural implementations can lead to unintended discrepancies between the hypotheses and their architectural, formal counterparts, a problem that is also known as the irrelevant specification problem (see Lewandowsky, Reference Lewandowsky1993).

In short, the recognition heuristic is arguably a simple mechanism of decision making. However, this simple decision making mechanism comes embedded into a rich cognitive system, and understanding the complexities of the interplay among the various mnemonic, perceptual, intentional and decisional components of this system and the simple recognition heuristic mechanism is a challenging task, warranting a formal, architectural approach to cognition. We propose that future recognition heuristic research should tackle this challenge and get a handle on these complexities of recognition-driven cognition. Tackling this challenge by means of formal, architectural approaches will most likely also help to shift the focus of the current controversies from what-has-been-said-by-whom to which computer code predicts behavior, and which computer code does not (or does not even run).Footnote ¹⁵

3.3 Falsifying a model is not enough: Conduct competitive model tests

There are different ways in which the recognition heuristic can be implemented in ACT-R or other architectures. Likewise, there are different ways in which competing (e.g., compensatory) models of decision making can be implemented. Regardless of the implementation chosen, there are at least three reasons why it is important to test corresponding models comparatively.

First, research on the recognition heuristic should not be about testing just this model in isolation, proclaiming whether it fits the data or not. Rather, research should be about identifying better models of behavior than those that already exist. This implies that research on the recognition heuristic should strive to develop new, alternative models, or strive to extend existing models, much like some researchers have done (see Erdfelder et al., Reference Erdfelder, Küpper-Tetzel and Mattern2011). At this stage of recognition heuristic research, falsificationism that comes without specifying an alternative theory is not enough. We hasten to add that the division of labor that characterized some of the past recognition heuristic research actually helps us to call for a research strategy shift today: Without past attempts to test and refute the recognition heuristic (but that did not propose alternative models), we would not know as much about recognition-based inference as we do today.

Second, formal model comparisons establish yardsticks for evaluating the descriptive adequacy of competing models, with the models being each other’s benchmarks in model evaluation. When just one model is tested, a discrepancy between the model’s predictions and the observed data might lead a researcher to reject that model. In contrast, with a comparison, the researcher may find that all models suffer (e.g., due to noise in the data), enabling her to find out which model suffers least. Paraphrasing Box (1979), all models are incorrect, but some models are useful, and model comparisons can help to find out which models are more useful than others.Footnote ¹⁶

Third, there may often exist many different models, all of which are equally capable of reproducing and explaining data—a dilemma that is also known as the identification problem (see Anderson, Reference Anderson1976). As a result it appears unreasonable to ask which of many process models is more truthful; rather, one needs to ask which model is better than another given a set of criteria, and one such criterion is for a model to outperform others in predicting behavior. In short, we propose that future research on the recognition heuristic should shift towards competitive model tests. First steps in this direction—in and outside of memory-based inferences—have been taken by Glöckner and Bröder (Reference Glöckner and Bröder2011), Marewski, Gaissmaier, Schooler, et al. (Reference Marewski, Gaissmaier, Schooler, Goldstein, Gigerenzer, Taatgen and van Rijn2009, 2010), Marewski and Mehlhorn (in press), and Pachur and Biele (Reference Pachur and Biele2007).

3.4 Move from binary questions to the building and testing of models of strategy selection

“Psychology …attempts to conceptualize what it is doing. …How do we do that? Mostly …by the construction of oppositions—usually binary ones. We worry about nature versus nurture, about central versus parallel, and so on”, wrote A. Newell in 1973 (p. 285). Almost forty years later, much of contemporary judgment and decision making research is still organized around binary oppositions, such as System I versus System II, intuitive versus deliberative, simple versus complex, and so on. Also research on the recognition heuristic has centered on dichotomies such as compensatory versus noncompensatory processes. What do psychologists gain from working with such binary oppositions? Possibly thinking and analyzing data in terms of dichotomies is easy, and corresponding ideas facilitate communication?

We do not know the answer. However, one lesson we all have learned to agree on during our adversarial collaboration is that recognition heuristic research would benefit if such dichotomous questions were replaced by what one may call when-questions, or the questions about processes. For instance, in our view it is not a fruitful endeavor to ask the dichotomous question whether recognition is always processed in either a compensatory or a noncompensatory fashion: Given the existing experimental evidence, neither of these extremes is likely to be true. Rather, we believe it makes more sense to ask the question when recognition will be used in a compensatory fashionFootnote ¹⁷ (i.e., as one piece of information among others), and when the recognition heuristic will come into play, with recognition being used in a noncompensatory fashion. Corresponding challenges to investigate the boundary conditions of recognition heuristic use have been formulated in the literature (e.g., B. R. Newell, Reference Newell2011; Tomlinson et al., Reference Tomlinson, Marewski and Dougherty2011); and indeed a number of studies provide insight with respect to these conditions (e.g., Ayton et al., Reference Ayton, Önkal and McReynolds2011; Bröder & Eichler, Reference Bröder and Eichler2006; Erdfelder et al., Reference Erdfelder, Küpper-Tetzel and Mattern2011; Hertwig et al., Reference Hertwig, Herzog, Schooler and Reimer2008; Hilbig, Scholl, et al., Reference Hilbig, Scholl and Pohl2010; Hochman et al., Reference Hochman, Ayal and Glöckner2010; Marewski, Gaissmaier, Schooler, et al., Reference Marewski, Gaissmaier, Schooler, Goldstein, Gigerenzer, Taatgen and van Rijn2009, 2010; Newell & Fernandez, Reference Newell and Fernandez2006; Oppenheimer, Reference Oppenheimer2003; Pachur et al., Reference Pachur, Bröder and Marewski2008, 2009; Pachur & Hertwig, Reference Pachur and Hertwig2006; Pohl, Reference Pohl2006; Volz et al., Reference Volz, Schooler, Schubotz, Raab, Gigerenzer and Cramon2006). However, until recently, there has been little attempt to integrate the findings from these studies into an overarching theory of strategy use (but see Gigerenzer & Goldstein, Reference Gigerenzer and Goldstein2011; Pohl, Reference Pohl2011).

Ideally a corresponding theory of strategy use would be sufficiently precise in order to be implemented in computer code, quantitatively predicting when the recognition heuristic will be used and when not. As of writing this text, we know of only one such computational model of strategy selection. This model has been developed within the aforementioned cognitive niche framework (Marewski & Schooler, Reference Marewski and Schooler2011; see Section 2.2) and has been built by using the ACT-R cognitive architecture.Footnote ¹⁸ According to the cognitive niche framework, heuristic use emerges as a function of how cognitive capacities such as memory or time perception represent and transform the structure of the environment into affordances (see Gibson, Reference Gibson1979) for heuristic use. With respect to the recognition heuristic, the model quantitatively predicts, for instance, that a person will be more likely to be able to quickly and effortlessly execute this heuristic when that person has additional knowledge about the recognized object. In this situation, the heuristic is also most likely to help the person to make a correct inference. Likewise, the heuristic is likely to help a person make accurate judgments when the person perceives the recognition times for the recognized object to be fast. These model predictions are derived from environmental data, such as how often a person will have read an object’s name on the internet or in other media.

Building such models of strategy selection is important for behavioral research on the recognition heuristic—otherwise researchers may fall prey of what we would like to call the strategy selection trap: Rejecting a model of a heuristic simply because it does not predict behavior in a certain situation is problematic, because there are two potential reasons for this (see Newell & Fernandez, Reference Newell and Fernandez2006). One is that the strategy is generally not a good model of behavior and warrants to be rejected, another is that the strategy is not used because people (or the corresponding selection mechanisms) choose not to use it in a particular situation. Disentangling these two explanations for a heuristic’s failure warrants a model of strategy use.Footnote ¹⁹ In short, we would like to encourage future recognition heuristic researchers to shift from simply binary oppositions to testing computational models of strategy selection.

3.5 Don’t just stay in the lab: Also go out into the wild

Marked by the publication of Woodworth’s (Reference Woodworth1938) classic textbook Experimental Psychology, the methodological dictate of mainstream experimental psychology—systematic design—has prescribed the isolation and manipulation of a few independent variables whereas all others are kept constant or varied randomly (Dhami, Hertwig, & Hoffrage, Reference Dhami, Hertwig and Hoffrage2004). This has led to the widespread acceptance of tightly controlled experimental tasks, often entailing solely a few impoverished, artificial stimuli that yield a maximum of control, for example, of participants’ pre-experimental exposure to the stimuli. Ecological theorizing, however, has motivated criticism of this methodology. Brunswik (Reference Brunswik1955) suggested that it destroys the natural covariation of variables in the organism’s habitat, making it hard to generalize from such experiments to the conditions under which the organism actually performs in its environment. In the real world, people hardly ever interact with only a few impoverished stimuli. People, newspaper ads, or features of cars rarely come in isolated packages; rather, they are often accompanied by a wealth of other information, such as the contexts in which we encounter other humans, read ads, or look at cars. Real-world, natural recognition, as has been hypothesized to be at play when the recognition heuristic is relied upon, comes with such a wealth of information.

Importantly, while there has been controversy with respect to how the domain of the recognition heuristic has actually been originally specified, there is little controversy that it has been an ecological model of decision making from the start. In fact, a number of studies has focused on investigating how useful recognition is as a forecasting tool for predicting real-world events, such as the outcomes of sports events (Herzog & Hertwig, Reference Herzog and Hertwig2011; Pachur & Biele, Reference Pachur and Biele2007; Scheibehenne & Bröder, Reference Scheibehenne and Bröder2007; Serwe & Frings, Reference Serwe and Frings2006), the results of political elections (e.g., Gaissmaier & Marewski, Reference Gaissmaier and Marewski2011), the performance of stocks (e.g., Borges, Goldstein, Ortmann, & Gigerenzer, Reference Borges, Goldstein, Ortmann, Gigerenzer, Gigerenzer and Todd1999), or whether a sense of recognition can be used to build automated recommender systems for literature selection in the library sciences (van Maanen & Marewski, Reference Van Maanen, Marewski, Taatgen and van Rijn2009), to name just a few. Yet, only a handful of studies have explored how people might exploit a sense of recognition for making decisions in the wild, say when it comes to decide in which neighborhood to live (Berg et al., Reference Berg, Hoffrage and Abramczuk2010). At the same time, there appears to be a number of phenomena that would lend themselves to corresponding investigations; including, for instance, social contact seeking among scientists at major conferences; as well as the broad field of marketing research (see Goldstein, Reference Goldstein2007; Hauser, Reference Hauser2011).

In short, the recognition heuristic is an ecological model of decision making. However, surprisingly little research has actually gone out into the wild, examining how people exploit a sense of prior encounter when making real-world decisions. Perhaps, debating over the various recognition heuristic controversies has largely kept us from asking questions that are of immediate relevance to the world—an unsatisfactory state of affairs. We hope that, through helping to resolve these controversies, this special issue contributes to changing this in the future.