A unified model of human semantic knowledge and its disorders

Phang Lang Chen, Matthew Lambon Ralph, Timothy T Rogers

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Abstract

How is knowledge about the meanings of words and objects represented in the human brain? Current theories embrace two radically different proposals: either distinct cortical systems have evolved to represent different kinds of things, or knowledge for all kinds is encoded within a single domain-general network. Neither view explains the full scope ofrelevant evidence from neuroimaging and neuropsychology. Here we propose that graded category-specificity emerges in some components of the semantic network through joint effects of learning and network connectivity. We test the proposal by measuring connectivity amongs cortical regions implicated in semantic representation, then simulating healthy and disordered semantic processing in a deep neural network whose architecture mirrors this structure. The resulting neuro-computational model explains the full complement of neuroimaging and patient evidence adduced in support of both domain-specific and domain-general approaches, reconciling long-standing disputes about the nature and origins of this uniquely human cognitive faculty.
Original languageEnglish
Article number0039
JournalNature Human Behaviour
Volume1
Early online date1 Mar 2017
DOIs
Publication statusE-pub ahead of print - 1 Mar 2017

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