Cognitive impenetrability is really two assertions: (1) perception and cognition have access to different knowledge bases; and (2) perception does not use cognitive-style processes. The first leads to the unusual corollary that cognition is itself cognitively impenetrable. The second fails when it is seen to be the claim that reasoning is available only in conscious processing.

Palmer's “subjectivity barrier” seems to be erected on a popular but highly suspect conception of visual experience, and his “color room” argument is invalid.

People often solve spatially presented cognitive problems more easily than their nonspatial counterparts. We explain this phenomenon by characterizing space as an inter-modality that provides common structure to different specific perceptual modalities. The usefulness of spatial structure for knowledge processing on different levels of granularity and for interaction between internal and external processes is described. Map representations are discussed as examples in which the usefulness of spatially organized symbols is particularly evident. External representations and processes can enhance internal representations and processes effectively when the same structures and principles can be implicitly assumed.

Pylyshyn is willing to assume that attention can influence feature integration. We argue that he concedes too much. Feature integration occurs preattentively, except in the case of certain “perverse” displays, such as those used in feature-conjunction searches.

The theory of lexical selection presented by Levelt, Roelofs & Meyer addresses the mechanisms of semantic activation that lead to the selection of isolated words. The theory does not appear to extend naturally to the referential use of words (particularly pronouns) in coherent discourse. A more complete theory of lexical selection has to consider the semantics of discourse as well as lexical semantics.

We applaud Campbell's cogent arguments for the evolution of female survival mechanisms but take issue with several key conceptual claims: the treatment of patriarchy; the implicit assumption that women are passive pawns in a male game of media exploitation; and the neglect of the possibility that media images exploit existing evolved psychological mechanisms rather than create them.

Dienes & Perner's target article constitutes a significant advance in thinking about implicit knowledge. However, it largely neglects processing details and thus the time scale of mental states realizing propositional attitudes. Considering real-time processing raises questions about the possible brevity of implicit representation, the nature of processes that generate explicit knowledge, and the points of view from which knowledge may be represented. Understanding the propositional attitude analysis in terms of momentary mental states points the way toward answering these questions.

Palmer's strategy of saving functionalism by constraining spectrum inversions cannot succeed because (1) there remain many nontrivial transformations not ruled out by Palmer's constraints, and (2) the constraints involved are due to the contingent makeup of our visual systems, and are therefore not available for use by functionalists.

A single evolved psychological mechanism, social identity, may help explain the development of salient sex differences in aggression. Bearing children automatically provides a basis for positive social identity for females. Masculine identity is more problematic, especially where the range of possible cultural roles is small. Ethnohistorical data provides insight into the overlap between masculine values and warrior values.

Amodality is not incompatible with being originally derived from sensory experience. The transformation of perceptual symbols into amodal abstractions could take place spontaneously through self-organizing processes such as autocatalysis. The organizational role played by “simulators” happens implicitly in a neural network, and quite possibly, in the brain as well.

We question the usefulness of Pylyshyn's dichotomy between cognitively penetrable and cognitively impenetrable mechanisms as the basis for his distinction between cognition and early vision. This dichotomy is comparable to others that have been proposed in psychology prompting disputes that by their very nature could not be resolved. This fate is inevitable for Pylyshyn's thesis because of its reliance on internal representations and their interpretation. What is more fruitful in relation to this issue is not a difficult dichotomy, but a different look at perception such as proposed by Gibson (1979).

Because, as Palmer shows, the only kinds of differences that can be detected are differences in relational structure, and relational structure is precisely what is preserved by isomorphism, his own arguments can be used to expose the incoherent motivation behind the traditional idea of “intrinsic qualities” of experience.

Dienes & Perner argue that there is a hierarchy of forms of implicit knowledge. One level of their hierarchy involves factuality, where it may be merely implicit that the state of affairs is supposed to be a real one rather than something imagined or fictional. I argue that the factual or fictional status of a thought or utterance cannot be a matter of concept, implicit or explicit.

I examine four core aspects of weaver++. The necessity for lemmas is often overstated. A model can incorporate interaction between levels without feedback connections between them. There is some evidence supporting the absence of inhibition in the model. Connectionist modelling avoids the necessity of a nondecompositional semantics apparently required by the hypernym problem.

Pylyshyn uses constraints to solve many of the problems associated with the inverse problem in vision. We are sympathetic to such an approach, and indeed, we think that in many cases constraints allow tract-able solutions to otherwise insoluble problems. We argue, however, that Pylyshyn has been too quick to assume that certain perceptual phenomena can be explained by appealing to constraints embodied in the visual machinery. For several more complex perceptual phenomena it is not clear how one proceeds to look for constraints once simple constraints like rigidity have been abandoned.

Men are more physically aggressive and more risk-prone than women, but are not necessarily more competitive. New data show the gender difference in competitiveness to be one of kind rather than degree, with women and men competing in different ways and, to some extent, over different objectives, but not differing in overall strength of competitive feeling.

The use of lexical concepts in Levelt et al.'s model requires further refinement with regard to syntactic factors in lexical choice, the prevention of pleonasm, and the representation of near-synonyms within and across languages.

Dienes & Perner (D&P) link explicit knowledge of facts to predication. But predication is basically a linguistic notion. Their approach therefore makes it difficult to attribute knowledge of facts to non- language-users, such as animals. The explicit/implicit distinction, as D&P formulate it, is accordingly of little use for exploring the cognitive capacities of nonhuman primates – despite the increasing evidence for sophisticated social awareness among apes, implying mental representations of events in which participants are clearly distinguished. A revised formulation, less biased toward syntax as it happens to have evolved in humans, could avoid this drawback.

Palmer's suggestion that color might serve as an appropriate field in which to test the hypotheses on the relations among brain, mind, and behavior is misleading. Human color experience as related to mind must be considered as a cultural, as well as a natural phenomenon. It is important to avoid approaching facts of language as mere nomenclature; otherwise, concepts are reduced to percepts.

We agree with Barsalou's claim about the importance of perceptual symbols in a theory of abstract concepts. Yet we maintain that the richness of many abstract concepts arises from the metaphorical mapping of recurring patterns of perceptual, embodied experience to provide essential structure to these abstract ideas.