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Is a picture worth a thousand words? Evidence from concept definitions by patients with semantic dementia

Lambon-Ralph, M. A., Graham, Kim Samantha, Patterson, K. and Hodges, J. R. 1999. Is a picture worth a thousand words? Evidence from concept definitions by patients with semantic dementia. Brain and Language 70 (3) , pp. 309-335. 10.1006/brln.1999.2143

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Abstract

Nine patients with semanticdementia (the temporal lobe variant of frontotemporal dementia) were asked to define concrete concepts either from presentation of apicture of the object or from its spoken name. As expected, the patients with the most severe semantic impairment produced the least detailed definitions, and the quality of the definitions overall was significantly related to concept familiarity. Further analyses of the definitions were designed to assess two key theoretical aspects of semantic organization. (i) Do objects and their corresponding names activate conceptual information in two neuroanatomically separable (modality-specific) semantic systems? If so, then—apart from any expected commonality in performance attributable to factors such as concept familiarity—one would not predict striking item-specific similarities in apatient's picture- and word-elicited definitions. (ii) Do sensory/perceptual features and more associative/functional attributes of conceptual knowledge form two neuroanatomically separable subsystems? If so, then one would predict significant dissociations in the prominence of these two types of information in the patients' definitions. The results lead us to favor a model of the semantic system that is divided by attribute type but not by modality.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Systems Immunity Research Institute (SIURI)
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Publisher: Elsevier
ISSN: 0093-934X
Last Modified: 04 Jun 2017 04:14
URI: http://orca.cf.ac.uk/id/eprint/35096

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