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The similarity-in-topography principle: Reconciling theories of conceptual deficits

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Three theories currently compete to explain the conceptual deficits that result from brain damage: sensory-functional theory, domain-specific theory, and conceptual structure theory. We argue that all three theories capture important aspects of conceptual deficits, and offer different insights into their origins. Conceptual topography theory (CTT) integrates these insights, beginning with A. R. Damasio's (1989) convergence zone theory and elaborating it with the similarity-in-topography (SIT) principle. According to CTT, feature maps in sensory-motor systems represent the features of a category's exemplars. A hierarchical system of convergence zones then conjoins these features to form both property and category representations. According to the SIT principle, the proximity of two conjunctive neurons in a convergence zone increases with the similarity of the features they conjoin. As a result, conjunctive neurons become topographically organised into local regions that represent properties and categories. Depending on the level and location of a lesion in this system, a wide variety of deficits is possible. Consistent with the literature, these deficits range from the loss of a single category to the loss of multiple categories that share sensory-motor properties.
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... On the one hand, at least some aspects of how a situation is captured and simulated need to be significantly constrained by genetic factors. Simmons and Barsalou (2003) comment that conjunctive neurons are combined to anticipate features that are of evolutionary significance in the cases of many animals. They further suggest that a similar mechanism works for human beings because we associate certain words with their encoded meanings, emotional expressions with emotions, and motor actions with visual outcomes. ...
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This thesis proposes a dual-route processing approach to the comprehension of poetic metaphor according to which mental imagery imposes procedural constraints on conceptual mental representations and thus contributes to inferencing the communicator’s intention. It seeks to develop the relevance theory account on the role of non-propositional effects in verbal communication allowing the incorporation of mental images, impressions, emotions, and other sensations. A review of major contemporary approaches to metaphor gives a good reason to favour the relevance-theoretic treatment that describes verbal comprehension as an inferential process. Representations of a set of assumptions are accessed to provide premises and result in conclusions following logical rules, or at least warranted by the premises. According to this view, metaphor is not fundamentally different from other uses of natural language: both require lexical pragmatic adjustments of the encoded concept in order to construct an occasion-specific concept whose denotation partially overlaps that of the original. This new concept resembles the communicator’s thought, and gives access to assumptions which will derive implications to make the utterance relevant-as-expected. Relevance theory regards non-propositional effects as the result of the communication of a wide array of weak but equally plausible implicated propositions. The account developed here considers alternative approaches to non-propositionality from affective science, grounded cognition, and Classical Chinese philosophy. After reworking the definition of mental imagery, it is suggested that non-propositional elements are not just triggered by linguistic processing but they also act as inputs to relevant cognitive activities. More specifically, imagery directs the hearer’s attention towards certain aspects of the metaphor by ‘pointing to’ constituents from personal history and bodily experience that perceptually resemble the sensory inputs from the represented object. Imagery contributes to understanding what the speaker intends to convey, using feedforward and feedback information to guide and constrain the search for relevance. This model therefore complements a purely propositional inferential model. By highlighting the ways in which mental imagery may affect inference, this thesis attempts to expand the scope of pragmatics. A comprehensive pragmatic theory of verbal communication should be able to account for the communication of not just thoughts with propositional forms but also non-propositional elements. Furthermore, the proposal may have some implications for literary studies of poetic metaphor by drawing attention to the cognitive dimensions involved in what is often treated in literary studies as intuitive and spontaneous.
... largely posterior to PHT, involving areas FST, TPOJ2, and several extrastriate parcels surrounding the MT complex (V4t, LO3, and TPOJ3), although there is also involvement of the posterior aspect of PHT. This proximity between areas showing category preferences for images and category preferences for words is consistent with a longstanding view of cortical organization in which sensory processing streams represent information in increasingly conjunctive and abstract form with greater distance from primary cortex (Damasio 1989;Tanaka 1996;Mesulam 1998;Simmons and Barsalou 2003). Recent work by Popham et al. (2021) provides similar evidence that visually-and verbally-elicited representations of object categories are aligned spatially near the occipitotemporal border, with verbally-elicited representations immediately anterior to representations elicited by object pictures (Orlov et al. 2010). ...
... Although concepts certainly reflect experience, they also have strong biological bases that scaffold learning. There is no a priori reason why grounded conceptual structures cannot have a strong genetic basis, especially in the sensory-motor feature and association areas that underlie them (e.g., Hoenig, Müller, Herrnberger, Spitzer, Ehret, & Kiefer, 2011;Kiefer et al., 2007;Simmons & Barsalou, 2003). ...
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