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Subtracting “ought” from “is”: Descriptivism versus normativism in the study of human thinking

Published online by Cambridge University Press:  14 October 2011

Shira Elqayam  and
Jonathan St. B. T. Evans
Shira Elqayam
Affiliation:
Division of Psychology, School of Applied Social Sciences, Faculty of Health and Life Sciences, De Montfort University, The Gateway, Leicester, LE1 9BH, United Kingdom. [email protected]://www.psy.dmu.ac.uk/elqayam
Jonathan St. B. T. Evans
Affiliation:
School of Psychology, Faculty of Science, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, United Kingdom. [email protected]://www.plymouth.ac.uk/staff/jevans
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Abstract

We propose a critique of normativism, defined as the idea that human thinking reflects a normative system against which it should be measured and judged. We analyze the methodological problems associated with normativism, proposing that it invites the controversial “is-ought” inference, much contested in the philosophical literature. This problem is triggered when there are competing normative accounts (the arbitration problem), as empirical evidence can help arbitrate between descriptive theories, but not between normative systems. Drawing on linguistics as a model, we propose that a clear distinction between normative systems and competence theories is essential, arguing that equating them invites an “is-ought” inference: to wit, supporting normative “ought” theories with empirical “is” evidence. We analyze in detail two research programmes with normativist features – Oaksford and Chater's rational analysis and Stanovich and West's individual differences approach – demonstrating how, in each case, equating norm and competence leads to an is-ought inference. Normativism triggers a host of research biases in the psychology of reasoning and decision making: focusing on untrained participants and novel problems, analyzing psychological processes in terms of their normative correlates, and neglecting philosophically significant paradigms when they do not supply clear standards for normative judgement. For example, in a dual-process framework, normativism can lead to a fallacious “ought-is” inference, in which normative responses are taken as diagnostic of analytic reasoning. We propose that little can be gained from normativism that cannot be achieved by descriptivist computational-level analysis, illustrating our position with Hypothetical Thinking Theory and the theory of the suppositional conditional. We conclude that descriptivism is a viable option, and that theories of higher mental processing would be better off freed from normative considerations.

Keywords

Bayesianismcompetencecomputational-level analysisdescriptivismis-ought inferencelogicismnormative systemsnormativismrational analysisrationalityresearch biasunderstanding/acceptance principle
Type
Target Article
Information
Behavioral and Brain Sciences , Volume 34 , Issue 5 , October 2011 , pp. 233 - 248
Copyright
Copyright © Cambridge University Press 2011

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References

Anderson, J. R. (1990) The adaptive character of thought. Erlbaum.Google Scholar
Anderson, J. R. (1991) Is human cognition adaptive? Behavioral and Brain Sciences 14:471–517.CrossRefGoogle Scholar
Austin, J. L. (1961) Other minds. In: Philosophical papers, ed. Urmson, J. O. & Warnock, G. J., pp. 44–84. Oxford University Press.Google Scholar
Barbey, A. K. & Sloman, S. A. (2007) Base rate respect: From ecological rationality to dual processes. Behavioral and Brain Sciences 30:241–97.CrossRefGoogle ScholarPubMed
Baron, J. (2008) Thinking and deciding, 4th edition. Cambridge University Press.Google Scholar
Barrouillet, P., Markovits, H. & Quinn, S. (2001) Developmental and content effects in reasoning with causal conditionals. Journal of Experimental Child Psychology 81:235–48.CrossRefGoogle Scholar
Braine, M. D. S. & O'Brien, D. P. (1998) The theory of mental-propositional logic: Description and illustration. In: Mental logic, ed. Braine, M. D. S. & O'Brien, D. P., pp. 79–89. Erlbaum.CrossRefGoogle Scholar
Byrne, R. M. J. & Handley, S. J. (1997) Reasoning strategies for suppositional deductions. Cognition 62:49.CrossRefGoogle ScholarPubMed
Byrne, R. M. J., Handley, S. J. & Johnson-Laird, P. N. (1995) Reasoning from suppositions. The Quarterly Journal of Experimental Psychology 48A:915–44.CrossRefGoogle Scholar
Cohen, L. J. (1981) Can human irrationality be experimentally demonstrated? Behavioral and Brain Sciences 4:317–70.CrossRefGoogle Scholar
Cohen, L. J. (1982) Are people programmed to commit fallacies? Further thought about the interpretation of data on judgement. Journal for the Theory of Social Behaviour 12:251–74.CrossRefGoogle Scholar
Cosmides, L. & Tooby, J. (1996) Are humans good intuitive statisticians after all? Rethinking some conclusions from the literature on judgment under uncertainty. Cognition 58:1–73.CrossRefGoogle Scholar
De Neys, W. & Glumicic, T. (2008) Conflict monitoring in dual process theories of thinking. Cognition 106:1248–99.CrossRefGoogle ScholarPubMed
Dennett, D. C. (1987) The intentional stance. MIT Press.Google Scholar
Dennett, D. C. (2008) Fun and games in fantasyland. Mind and Language 23:25–31.CrossRefGoogle Scholar
De Saussure, F. (1916/1966) Course in general linguistics. (Original publication, 1916). McGraw-Hill.Google Scholar
Dijksterhuis, A., Bos, M. W., Nordgren, L. F., & van Baaren, R. B. (2006) On making the right choice: The deliberation-without-attention effect. Science, 311:1005–1007.CrossRefGoogle ScholarPubMed
Edgington, D. (1995) On conditionals. Mind 104:235–329.CrossRefGoogle Scholar
Edgington, D. (2003) What if? Questions about conditionals. Mind and Language 18:380–401.CrossRefGoogle Scholar
Edgington, D. (2008) Conditionals. In: Stanford encyclopedia of philosophy, ed. Zalta, E. N.. Stanford University. (Online publication. Available at: http://plato.stanford.edu/archives/win2008/entries/conditionals/).Google Scholar
Elqayam, S. (2003) Norm, error and the structure of rationality: The case study of the knight-knave paradigm. Semiotica 147:265–89.Google Scholar
Elqayam, S. (2006) The collapse illusion effect: A pragmatic–semantic illusion of truth and paradox. Thinking and Reasoning 12:180.CrossRefGoogle Scholar
Elqayam, S. (2011) Grounded rationality: A relativist framework for normative rationality. In: The science of reason: A Festschrift in honour of Jonathan St. B. T. Evans, ed. Manktelow, K. I., Over, D. E. & Elqayam, S., pp. 397–420. Psychology Press.Google Scholar
Evans, J. St. B. T. (1972) Interpretation and matching bias in a reasoning task. Quarterly Journal of Experimental Psychology 24:193–99.CrossRefGoogle Scholar
Evans, J. St. B. T. (1982) The psychology of deductive reasoning. Routledge.Google Scholar
Evans, J. St. B. T. (1989) Bias in human reasoning: Causes and consequences. Erlbaum.Google Scholar
Evans, J. St. B. T. (1993) Bias and rationality. In: Rationality: Psychological and philosophical perspectives, ed. Manktelow, K. I. & Over, D. E., pp. 6–30. Routledge.Google Scholar
Evans, J. St. B. T. (2002) Logic and human reasoning: An assessment of the deduction paradigm. Psychological Bulletin 128:978–96.CrossRefGoogle ScholarPubMed
Evans, J. St. B. T. (2003) In two minds: Dual process accounts of reasoning. Trends in Cognitive Sciences 7:454–59.CrossRefGoogle ScholarPubMed
Evans, J. St. B. T. (2006) The heuristic–analytic theory of reasoning: Extension and evaluation. Psychonomic Bulletin and Review 13:378–95.CrossRefGoogle ScholarPubMed
Evans, J. St. B. T. (2007) Hypothetical thinking: Dual processes in reasoning and judgement. Psychology Press.CrossRefGoogle Scholar
Evans, J. St. B. T. (2008) Dual-processing accounts of reasoning, judgment and social cognition. Annual Review of Psychology 59:255–78.CrossRefGoogle ScholarPubMed
Evans, J. St. B. T. (2010b) Thinking twice: Two minds in one brain. Oxford University Press.Google Scholar
Evans, J. St. B. T. (in press b) Reasoning. In: The Oxford handbook of cognitive psychology, ed. Reisberg, D.. Oxford University Press.Google Scholar
Evans, J. St. B. T., Barston, J. L. & Pollard, P. (1983) On the conflict between logic and belief in syllogistic reasoning. Memory and Cognition 11:295–306.CrossRefGoogle ScholarPubMed
Evans, J. St. B. T. & Coventry, K. (2006) A dual-process approach to behavioral addiction: The case of gambling. In: Handbook of implicit cognition and addiction, ed. Wiers, R. W., Stacy, A. W., R. pp. 29–43. Sage.CrossRefGoogle Scholar
Evans, J. St. B. T. & Frankish, K., eds. (2009) In two minds: Dual processes and beyond. Oxford University Press.CrossRefGoogle Scholar
Evans, J. St. B. T. & Handley, S. J. (1999) The role of negation in conditional inference. Quarterly Journal of Experimental Psychology 52A:739–69.CrossRefGoogle Scholar
Evans, J. St. B. T., Handley, S. J. & Over, D. E. (2003) Conditionals and conditional probability. Journal of Experimental Psychology: Learning, Memory and Cognition 29(2):321–55.Google ScholarPubMed
Evans, J. St. B. T., Handley, S. J., Perham, N., Over, D. E. & Thompson, V. A. (2000) Frequency versus probability formats in statistical word problems. Cognition 77:197–213.CrossRefGoogle ScholarPubMed
Evans, J. St. B. T., Newstead, S. E. & Byrne, R. M. J. (1993) Human reasoning: The psychology of deduction. Erlbaum.Google Scholar
Evans, J. St. B. T. & Over, D. E. (1996) Rationality and reasoning. Psychology Press.Google Scholar
Evans, J. St. B. T. & Over, D. E. (2004) If. Oxford University Press.CrossRefGoogle Scholar
Evans, J. St. B. T., Over, D. E. & Handley, S. J. (2005) Suppositions, extensionality, and conditionals: A critique of the mental model theory of Johnson-Laird & Byrne (2002). Psychological Review 112:1040–52.CrossRefGoogle ScholarPubMed
Feeney, A. (2007) Individual differences, dual processes, and induction. In: Inductive reasoning, ed. Feeney, A. & Heit, E., pp. 302–27. Cambridge University Press.Google Scholar
Ferreira, M. B., Garcia-Marques, L., Sherman, S. J. & Sherman, J. W. (2006) Automatic and controlled components of judgment and decision making. Journal of Personality and Social Psychology 91:797–813.CrossRefGoogle ScholarPubMed
Fodor, J. A. (2008) Against Darwinism. Mind and Language 23:1–24.CrossRefGoogle Scholar
Frankena, W. (1939) The naturalistic fallacy. Mind 48:464–77.CrossRefGoogle Scholar
Gigerenzer, G. (1991) How to make cognitive illusions disappear: Beyond “heuristics and biases.” In: European review of social psychology, ed. Stroebe, W. & Hewstone, M., pp. 83–115. Wiley.Google Scholar
Gigerenzer, G. (2007) Gut feelings: The intelligence of the unconscious. Viking Press.Google Scholar
Gigerenzer, G. & Hoffrage, U. (1995) How to improve Bayesian reasoning without instruction: Frequency formats. Psychological Review 102:684–704.CrossRefGoogle Scholar
Gigerenzer, G. & Selten, R. (2001) Bounded rationality: The adaptive toolbox. MIT Press.Google Scholar
Gigerenzer, G. & Todd, P. M. (1999) Fast and frugal heuristics: The adaptive toolbox. In: Simple heuristics that make us smart, ed. Gigerenzer, G., Todd, P. M. & the ABC Research Group, pp. 3–34. Oxford University Press.Google Scholar
Gigerenzer, G., Todd, P. M. & the ABC Research Group, eds. (1999) Simple heuristics that make us smart. Oxford University Press.Google Scholar
Gilovich, T., Griffin, D. & Kahneman, D. (2002) Heuristics and biases: The psychology of intuitive judgement. Cambridge University Press.CrossRefGoogle Scholar
Gottwald, S. (2001) A treatise on many-valued logics. (Studies in Logic and Computation, vol. 9). Research Studies Press.Google Scholar
Gould, S. J. & Lewontin, R. C. (1979) The spandrels of San Marco and the Panglossian paradigm: A critique of the adaptationist programme. Proceedings of the Royal Society of London, Series B 205:581–98.Google Scholar
Hahn, U. & Warren, P. A. (2009) Perceptions of randomness: Why three heads are better than four. Psychological Review 116(2):454–61.CrossRefGoogle ScholarPubMed
Hare, R. M. (1969) Descriptivism. In The is-ought question: A collection of papers on the central problem in moral philosophy, ed. Hudson, W. D., pp. 240–58. Macmillan.CrossRefGoogle Scholar
Hare, R. M. (1993) Essays in ethical theory. Oxford University Press.CrossRefGoogle Scholar
Harris, R. (1980) The language-makers. Duckworth.Google Scholar
Harris, R. (1981) The language myth. Duckworth.Google Scholar
Howson, C. & Urbach, P. (1993) Scientific reasoning, 2nd edition. Open Court.Google Scholar
Hudson, W. D., ed. (1969) The is-ought question: A collection of papers on the central problem in moral philosophy. Macmillan.CrossRefGoogle Scholar
Hume, D. (1739–1740/2000) A treatise on human nature. (Original work published in 1739–1740). Clarendon Press.Google Scholar
Inhelder, B. & Piaget, J. (1958) The growth of logical thinking. Basic Books.Google Scholar
Jackendoff, R. (2002) Foundations of language: Brain, meaning, grammar, evolution. Oxford University Press.CrossRefGoogle Scholar
Johnson-Laird, P. N. & Byrne, R. M. J. (1991) Deduction. Erlbaum.Google Scholar
Johnson-Laird, P. N. & Byrne, R. M. J. (2002) Conditionals: A theory of meaning, pragmatics and inference. Psychological Review 109:646–78.CrossRefGoogle ScholarPubMed
Kahneman, D. & Frederick, S. (2002) Representativeness revisited: Attribute substitution in intuitive judgement. In: Heuristics and biases: The psychology of intuitive judgement, ed. Gilovich, T., Griffin, D. & Kahneman, D., pp. 49–81. Cambridge University Press.CrossRefGoogle Scholar
Kahneman, D. & Tversky, A. (1972) Subjective probability: A judgment of representativeness. Cognitive Psychology 3:430–54.CrossRefGoogle Scholar
Kahneman, D. & Tversky, A. (1979) Prospect theory: An analysis of decision under risk. Econometrica 47:263–91.CrossRefGoogle Scholar
Klauer, K. C., Musch, J. & Naumer, B. (2000). On belief bias in syllogistic reasoning. Psychological Review 107:852–84.CrossRefGoogle ScholarPubMed
Klein, G. A. (1998) Sources of power: How people make decisions. MIT Press.Google Scholar
Koehler, J. J. (1996) The base rate fallacy reconsidered: Descriptive, normative and methodological challenges. Behavioral and Brain Sciences 19:1–53.CrossRefGoogle Scholar
Kripke, S. (1975) Outline of a theory of truth. Journal of Philosophy 72:690–716.CrossRefGoogle Scholar
Lewis, G. L. (1999) The Turkish language reform: A catastrophic success. Oxford University Press.CrossRefGoogle Scholar
Lieberman, M. D. (2007) Social cognitive neuroscience: A review of core processes. Annual Review of Psychology 58:259–89.CrossRefGoogle ScholarPubMed
Lopes, L. L. (1991) The rhetoric of irrationality. Theory and Psychology 1:65–82.CrossRefGoogle Scholar
MacIntyre, A. C. (1959) Hume on “is” and “ought.” Philosophical Review 68:451–68.CrossRefGoogle Scholar
Manktelow, K. I. & Over, D. E. (1991) Social roles and utilities in reasoning with deontic conditionals. Cognition 39:85–105.CrossRefGoogle ScholarPubMed
Marr, D. (1982) Vision: A computational investigation into the human representation and processing of visual information. W. H. Freeman.Google Scholar
Martin, R. L., ed. (1984) Recent essays on truth and the liar paradox. Oxford University Press.Google Scholar
McGee, V. (1985) A counterexample to modus ponens. Journal of Philosophy 82:462–71.CrossRefGoogle Scholar
Millikan, R. G. (1984) Language, thought, and other biological categories: New foundations for realism. MIT Press.CrossRefGoogle Scholar
Millikan, R. G. (1995) White Queen psychology and other essays for Alice. MIT Press.CrossRefGoogle Scholar
Millikan, R. G. (1996) Pushmi-pullyu representations. In: Minds and morals, ed. May, L., Friedman, L. & Clark, A., pp. 145–62. MIT Press.Google Scholar
Moore, G. E. (1903) Principia ethica. Cambridge University Press.Google Scholar
Nickerson, R. S. (2008) Aspects of rationality: Reflections on what it means to be rational and whether we are. Psychology Press.Google Scholar
Nisbett, R. E., Krantz, D. H., Jepson, D. H. & Kunda, Z. (1983) The use of statistical heuristics in everyday inductive reasoning. Psychological Review 90:339–63.CrossRefGoogle Scholar
Nozick, R. (1993) The nature of rationality. Princeton University Press.CrossRefGoogle Scholar
Oaksford, M. & Chater, N. (1991) Against logicist cognitive science. Mind and Language 6:1–38.CrossRefGoogle Scholar
Oaksford, M. & Chater, N. (1994) A rational analysis of the selection task as optimal data selection. Psychological Review 101:608–31.CrossRefGoogle Scholar
Oaksford, M. & Chater, N. (1996) Rational explanation of the selection task. Psychological Review 103:381–91.CrossRefGoogle Scholar
Oaksford, M. & Chater, N. (1998a) Rationality in an uncertain world. Psychology Press.Google Scholar
Oaksford, M. & Chater, N. (2007) Bayesian rationality: The probabilistic approach to human reasoning. Oxford University Press.CrossRefGoogle Scholar
Over, D. E. (2007) Content-independent conditional inference. In: Integrating the mind: Domain general versus domain specific processes in higher cognition, ed. Roberts, M. J., pp. 83–104. Psychology Press.Google Scholar
Over, D. E. & Evans, J. St. B. T. (1997) Two cheers for deductive competence. Current Psychology of Cognition 16:255–78.Google Scholar
Over, D. E., Evans, J. St. B. T. & Elqayam, S. (2010) Conditionals and non-constructive reasoning. In: Cognition and conditionals: Probability and logic in human thinking, ed. Oaksford, M. & Chater, N., pp. 135–51. Oxford University Press.CrossRefGoogle Scholar
Pfeifer, N. & Kleiter, G. D. (2011) Uncertain deductive reasoning. In: The science of reason: A Festschrift for Jonathan St. B.T. Evans, ed. Manktelow, K. I., Over, D. E. & Elqayam, S., pp. 145–66. Psychology Press.Google Scholar
Ramsey, F. P. (1931/1990) General propositions and causality. In: Philosophical papers, ed. Mellor, D. H., pp. 145–63. Cambridge University Press. (Original publication, 1931).Google Scholar
Raylu, N. & Oei, T. P. S. (2002) Pathological gambling: A comprehensive review. Clinical Psychology Review 22:1009–61.CrossRefGoogle ScholarPubMed
Rescher, N. (1969) Many-valued logics. McGraw-Hill.Google Scholar
Reyna, V. F. (2004) How people make decisions that involve risk: A dual-processes approach. Current Directions in Psychological Science 13:60–66.CrossRefGoogle Scholar
Rips, L. J. (1989) The psychology of knights and knaves. Cognition 31:85–116.CrossRefGoogle ScholarPubMed
Rips, L. J. (1994) The psychology of proof. MIT Press.CrossRefGoogle Scholar
Savage, L. J. (1954) The foundations of statistics. Wiley.Google Scholar
Schroyens, W. (2009) On is an ought: Levels of analysis and the descriptive versus normative analysis of human reasoning. Behavioral and Brain Sciences 32:101–102.CrossRefGoogle Scholar
Schroyens, W. (2010) Logic and/in psychology: The paradoxes of material implication and psychologism in the cognitive science of human reasoning. In: Cognition and conditionals: Probability and logic in human thinking, ed. Oaksford, M. & Chater, N., pp. 69–84. Oxford University Press.CrossRefGoogle Scholar
Schroyens, W., Schaeken, W. & d'Ydewalle, G. (1999) Error and bias in meta-propositional reasoning: A case of the mental model theory. Thinking and Reasoning 5:65.CrossRefGoogle Scholar
Schurz, G. (1997) The is-ought problem: An investigation in philosophical logic. Kluwer.CrossRefGoogle Scholar
Searle, J. R. (1964) How to derive “ought” from “is”. Philosophical Review 73:43–58.CrossRefGoogle Scholar
Simon, H. A. (1982) Models of bounded rationality. MIT Press.Google Scholar
Sloman, S. A. (1996) The empirical case for two systems of reasoning. Psychological Bulletin 119:3–22.CrossRefGoogle Scholar
Slovic, P. & Tversky, A. (1974) Who accepts Savage's axiom? Behavioral Science 19:364–71.CrossRefGoogle Scholar
Smith, E. R. & DeCoster, J. (2000) Dual-process models in social and cognitive psychology: Conceptual integration and links to underlying memory systems. Personality and Social Psychology Review 4:108–31.CrossRefGoogle Scholar
Stanovich, K. E. (1999) Who is rational? Studies of individual differences in reasoning. Elrbaum.CrossRefGoogle Scholar
Stanovich, K. E. (2004) The robot's rebellion: Finding meaning in the age of Darwin. Chicago University Press.CrossRefGoogle Scholar
Stanovich, K. E. (2009a) Distinguishing the reflective, algorithmic, and autonomous minds: Is it time for a tri-process theory? In: In two minds: Dual processes and beyond, ed. Evans, J. St. B. T. & Frankish, K., pp. 55–88. Oxford University Press.CrossRefGoogle Scholar
Stanovich, K. E. (2009b) What intelligence tests miss: The psychology of rational thought. Yale University Press.Google Scholar
Stanovich, K. E. (2010a) Decision making and rationality in the modern world. Oxford University Press.Google Scholar
Stanovich, K. E. & West, R. F. (1998) Cognitive ability and variation in selection task performance. Thinking and Reasoning 4:193–230.CrossRefGoogle Scholar
Stanovich, K. E. & West, R. F. (2000b) Individual differences in reasoning: Implications for the rationality debate. Behavioral and Brain Sciences 23:645–726.CrossRefGoogle ScholarPubMed
Stanovich, K. E. & West, R. F. (2003) The rationality debate as a progressive research program. Behavioral and Brain Sciences 26:531–34.CrossRefGoogle Scholar
Stanovich, K. E. & West, R. F. (2008) On the relative independence of thinking biases and cognitive ability. Journal of Personality and Social Psychology 94:672–95.CrossRefGoogle ScholarPubMed
Stein, E. (1996) Without good reason: The rationality debate in philosophy and cognitive science. Oxford University Press/Clarendon Press.Google Scholar
Stenning, K. & van Lambalgen, M. (2008) Human reasoning and cognitive science. MIT Press.CrossRefGoogle Scholar
Stich, S. (1990) The fragmentation of reason: Preface to a pragmatic theory of cognitive evaluation. MIT Press.Google Scholar
Verschueren, N., Schaeken, W., & d'Ydewalle, G. (2005) A dual-process specification of causal conditional reasoning. Thinking and Reasoning 11: 239–78.CrossRefGoogle Scholar
von Neumann, J. & Morgenstern, O. (1947) Theory of games and economic behavior, 2nd edition. Princeton University Press.Google Scholar
Wagenaar, W. A. (1988) Paradoxes of gambling behaviour. Erlbaum.Google Scholar
Wason, P. C. (1960) On the failure to eliminate hypotheses in a conceptual task. Quarterly Journal of Experimental Psychology 12:12–40.CrossRefGoogle Scholar
Wason, P. C. (1966) Reasoning. In: New horizons in psychology, vol. 1, ed. Foss, B. M., pp. 106–37. Penguin.Google Scholar
Wason, P. C. & Brooks, P. G. (1979) THOG: The anatomy of a problem. Psychological Research 41:79–90.CrossRefGoogle Scholar
Whitehead, A. N. & Russell, B. (1910/1962) Principia Mathematica. Cambridge University Press. (Original publication, 1910).Google Scholar
Williams, B. (1985) Ethics and the limits of philosophy. Harvard University Press.Google Scholar
Wilson, T. D. & Schooler, J. W. (1991) Thinking too much: Introspection can reduce the quality of preferences and decisions. Journal of Personality and Social Psychology, 60:181–92.CrossRefGoogle ScholarPubMed