According to the Perceptual Symbols Theory of cognition (), modality‐specific simulations underlie the representation of concepts. A strong prediction of this view is that perceptual processing affects conceptual processing. In this study, participants performed a perceptual detection task and a conceptual property‐verification task in alternation. Responses on the property‐verification task were slower for those trials that were preceded by a perceptual trial in a different modality than for those that were preceded by a perceptual trial (...) in the same modality. This finding of a modality‐switch effect across perceptual processing and conceptual processing supports the hypothesis that perceptual and conceptual representations are partially based on the same systems. (shrink)

Perceptual processes, in particular modular processes, have long been understood as being mandatory. But exactly what mandatoriness amounts to is left to intuition. This paper identifies a crucial ambiguity in the notion of mandatoriness. Discussions of mandatory processes have run together notions of automaticity and ballisticity. Teasing apart these notions creates an important tool for the modularist's toolbox. Different putatively modular processes appear to differ in their kinds of mandatoriness. Separating out the automatic from the ballistic can help the (...) modularist diagnose and explain away some putative counterexamples to multimodal and central modules, thereby helping us to better evaluate the evidentiary status of modularity theory. (shrink)

This chapter presents findings indicating that psilocybin-induced visual distortions and impaired executive functioning originate in temporary disruptions of attentional mechanisms. It then revisits a predictive processing account of neural processing and argues that this lacks the resources to provide a unified model of the perceptual mechanisms underpinning psychedelic experiences caused by classic hallucinogens such as psilocybin, lysergic acid diethylamide (LSD), and mescaline. Lastly, an alternative theory of perceptual processing is proposed—the Gist Theory of Perception—that can better explain how (...) the psilocybin-induced disruptions of attentional mechanisms may elicit psychedelic experiences. (shrink)

This is a complex work by the author of The Moral Nature of Man. First, it is an inventory of the perceptual world using as a tool an original distinction between noticing and observing. This leads to the establishment of a continuity between the conscious and the subconscious, and to the discernment of various meaning-giving levels of attention. Secondly, it is a review of opinion on sensation and perception in recent Anglo-American thought. Particular attention is given to the ideas (...) of Price, Ayer, and Austin. Thirdly, and most importantly, it contains a full theory of reality based on: 1) the resistance or centered action of dynamic systems; 2) the purposive action that meets this resistance; and 3) the emergence of qualia from the encounter of 1 and 2. The method is that of description of ordinary language conceptions of sensation and sensa, "things," interaction and causation, and symbol. From this analysis Garnett obtains some original conclusions about sense qualia and brain processes, body and mind, and, in general, about the physical and mental elements of the universe.—A. M. (shrink)

Does the perceptual processing of faces flexibly adapt to the requirements of the categorization task at hand, or does it operate independently of this cognitive context? Behavioral studies have shown that the fine and coarse spatial scales of a face are differentially processed depending on the categorization task performed, thus suggesting that the latter can influence stimulus perception. Here, we investigated the time course of these task influences on perceptual processing by examining the visual N170 face‐sensitive Event‐Related Potential (...) (ERP), while observers categorized faces for their gender and familiarity. Stimuli were full spectrum, or filtered versions that preserved either coarse or fine scale information of the faces. Behavioral results replicated previous findings of a differential processing of coarse and fine spatial scales across tasks. In addition, the N170 amplitude was larger in the Gender task as compared to the Familiarity task for LSF faces exclusively, thus showing that task demands differentially modulated the spatial scale processing on faces. These results suggest that the diagnosticity of scale‐specific cues in categorization tasks can modulate face processing. (shrink)

In higher-level cognitive tasks, older compared to younger adults show a bias towards positive emotion information and away from negative information (a positivity effect). It is unclear whether this effect occurs in early perceptual processing. This issue is important for determining if the positivity effect is due to automatic rather than controlled processing. We tested this with older and younger adults on a positive/negative face emotion valence classification task using masked priming. Positive (happy) and negative (angry) face targets were (...) preceded by masked repetition or valence primes with neutral face baselines. In Experiment 1, 30 younger and 30 older adults were tested with 50 ms primes. Younger adults showed repetition priming for both positive and negative targets. Older adults showed repetition priming for positive but not negative targets. Neither group showed valence priming. In Experiment 2, 30 older and 29 younger adults were tested with longer duration primes. Younger adults showed repetition priming for both positive and negative emotions, and no valence priming. Older adults only showed repetition and valence priming for positive targets. We proposed older adults’ lack of angry face priming was due to an early attention orienting strategy favouring happy expressions at the expense of angry ones. (shrink)

The Objective Threshold/Strategic Model proposes that strong, qualitative inferences of unconscious perception can be made if the relationship between perceptual sensitivity and stimulus visibility is nonlinear and nonmonotonic. The model proposes a nadir in priming effects at the objective identification threshold . These predictions were tested with masked semantic priming and repetition priming of a lexical decision task. The visibility of the prime stimuli was systematically varied above and below the objective identification threshold. The obtained relationship between prime visibility (...) and priming facilitation was nonlinear, but the results failed to confirm a nadir in priming effects at the objective identification threshold. We conclude that the objective identification threshold does not necessarily indicate the point where presumably unconscious priming effects might be inhibited by conscious cognitive processes. (shrink)

We found a direct relationship between variation in informants' grammaticality intuitions about pronoun coreference and variation in the same informants' use of a clause segmentation strategy during sentence perception. It has been proproposed that ‘c‐command’, a structural principle defined in terms of constituent dominance relations, constrains within‐sentence coreference between pronouns and noun antecedents. The relative height of the pronoun and the noun in the phrase structure hierarchy determines whether the c‐command constraint blocks coreference: Coreference is allowed only when the complement (...) structure containing the noun is attached higher than the pronoun. We collected informants' judgments on pronoun‐noun coreference in which the noun antecedent was contained in a complement structure dominated by either the Sentence‐node (S‐node) (higher than the pronoun) or the Verb‐phrase‐node (VP‐node) (not higher than the pronoun). We also assessed each informant's perceptual clause‐closure tendency using an auditory word‐monitor paradigm. Informants who strongly segmented clauses in the perceptual task did not differentiate between an S‐ and VP‐attachment of sentence complements, as revealed in their coreference judgments, but rather appeared to attach all sentence complements to the S‐node. Informants with relatively weak perceptual segmentation differentiated their coreference judgments according to the node attachment of the complement structure. These results indicate that the linguistic universal controlling within‐sentence coreference applies to the perceptually available structure for a sequence, not to its pure linguistic structure. Hence, linguistic intuitions result from the interaction of three independent faculties: language‐specific knowledge, perceptual processes, and linguistic universals. (shrink)

Blindsight and vision for action seem to be exemplars of unconscious visual processes. However, researchers have recently argued that blindsight is not really a kind of uncon- scious vision but is rather severely degraded conscious vision. Morten Overgaard and col- leagues have recently developed new methods for measuring the visibility of visual stimuli. Studies using these methods show that reported clarity of visual stimuli correlates with accuracy in both normal individuals and blindsight patients. Vision for action has also come under (...) scrutiny. Recent findings seem to show that information processed by the dor- sal stream for online action contributes to visual awareness. Some interpret these results as showing that some dorsal stream processes are conscious visual processes (e.g., Gallese, 2007; Jacob & Jeannerod, 2003). The aim of this paper is to provide new support for the more traditional view that blindsight and vision for action are genuinely unconscious per- ceptual processes. I argue that individuals with blindsight do not have access to the kind of purely qualitative color and size information which normal individuals do. So, even though people with blindsight have a kind of cognitive consciousness, visual information process- ing in blindsight patients is not associated with a distinctly visual phenomenology. I argue further that while dorsal stream processing seems to contribute to visual awareness, only information processed by the early dorsal stream (V1, V2, and V3) is broadcast to working memory. Information processed by later parts of the dorsal stream (the parietal lobe) never reaches working memory and hence does not correlate with phenomenal awareness. I con- clude that both blindsight and vision for action are genuinely unconscious visual processes. (shrink)

The relationship between perceptual categorization and organization processes in 3‐ to 4‐month‐old infants was explored. The question was whether an invariant part abstracted during category learning could interfere with Gestalt organizational processes. Experiment 1 showed that the infants could parse a circle in accord with good continuation from visual patterns consisting of a circle and a complex polygon. In Experiments 2 and 3, however, this parsing was interfered with by a prior category familiarization experience in which infants were presented (...) with visual patterns consisting of a pacman shape and a complex polygon. Part 1 of Experiments 2 and 3 showed that the infants recognized the pacman as familiar, and Part 2 demonstrated that the representation of the pacman blocked the subsequent parsing of the circle. The results suggest that a cognitive system of flexible feature creation can override organizational principles with which a perceptual system may come pre‐equipped. (shrink)

Professor Campbell Garnett has here presented a history, critique and synthesis of several widely diverse philosophical methods and conclusions. With great simplicity he gives an account of the genesis of idealism and the early twentieth century reaction towards realism, highlighting William James’ ‘Does Consciousness Exist’ and G E Moore’s ‘Refutation of Idealism’. Two methods involved are singled out: introspection, emphasised by the ‘acknowledged master of this art’, James and Moore’s linguistic analysis, leading to the analysis of ordinary language and the (...) attempt to develop an ideal language. The author then proposes the analysis of mental life as the most important and central task of the philosopher.. In proof of the validity of this method, it is said that ‘All the various departments of philosophy are analyses of different parts or phases of mental life. Logic is an analysis of the processes of statements and inference; ethics is an analysis of the moral consciousness, and aesthetics of the aesthetic consciousness; epistemology is an analysis of the processes of perception and conception’. This seems to me misleading; the author has already associated analysis of mental life with armchair psychology; and can ‘analysis’ be used to cover critical evaluation? This characterisation of the task of philosophy leads to seeing phenomenology, as ‘a technique in which reflective analysis of the categories is sharpened by the setting aside of other questions’ which is very vague; ‘analysis of ordinary language’ is said to be ‘an analysis of meaning, not in the objective sense of the usage of words as described in the dictionary, but in the subjective sense of their use, of what the use means or intends to do by framing and uttering his sentences’. It also leads to that conflation of philosophy of mind and epistemology/ontology which leads to much confusion, and which it has been the achievement of contemporary philosophy on both sides of the linguistic divide to disentangle. (shrink)

Garnett attempts to defend realism while accepting much of what sense-data theorist have had to say. He does this by tracing the origin of our belief in external objects to the finding of "centres of resistance" in the experience of effort and resistance, these centres being symbolized by sensory qualia. Since the centres are found in experience they are not unknowable Lockean substances, and since the resistance is something over and above sensations of pressure they are not phenomenalistic patterns of (...) sense-data. Though a great deal of the book is devoted to the "refutation" of particular arguments of Ryle and Austin, Garnett seems oblivious to the thrust of recent criticism of traditional accounts of the role of sense qualia in perception. All too often he allows assertion to replace argument.—A. E. J. (shrink)