Sasha Bozeat studied conceptual knowledge in semantic dementia using assessments that reduced verbal input and output demands. Nonverbal tasks test whether a difficulty extends beyond finding the name of an object. Comparing tasks across modalities therefore helps separate a language-specific naming problem from a broader impairment in the knowledge used to recognize or use objects. [ref]
Non-verbal semantic impairment in semantic dementia by Sasha Bozeat and others. 2000, nonverbal semantic assessments
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