Typicality within well defined categories in aphasia

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Typicality mediates performance during category verification in both ad-hoc and well-defined categories.

BACKGROUND The typicality effect is present in neurologically intact populations for natural, ad-hoc, and well-defined categories. Although sparse, there is evidence of typicality effects in persons with chronic stroke aphasia for natural and ad-hoc categories. However, it is unknown exactly what influences the typicality effect in this population. AIMS The present study explores the possible...

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Typicality in logically defined categories: exemplar-similarity versus rule instantiation.

A rule-instantiation model and a similarity-to-exemplars model were contrasted in terms of their predictions of typicality judgments and speeded classifications for members of logically defined categories. In Experiment 1, subjects learned a unidimensional rule based on the size of objects. It was assumed that items that maximally instantiated the rule were those farthest from the category boun...

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Semantic complexity in treatment of naming deficits in aphasia: evidence from well-defined categories.

PURPOSE Our previous work on manipulating typicality of category exemplars during treatment of naming deficits has shown that training atypical examples generalizes to untrained typical examples but not vice versa. In contrast to natural categories that consist of fuzzy boundaries, well-defined categories (e.g., shapes) have rigid category boundaries. Whether these categories illustrate typical...

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Semantic Typicality Effects in Primary Progressive Aphasia.

Prototypical items within a semantic category are processed faster than atypical items within the same category. This typicality effect reflects normal representation and processing of semantic categories and when absent may be reflective of lexical-semantic deficits. We examined typicality effects in individuals with semantic and nonsemantic variants of primary progressive aphasia (PPA; semant...

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ژورنال

عنوان ژورنال: Brain and Language

سال: 2006

ISSN: 0093-934X

DOI: 10.1016/j.bandl.2006.06.089