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Portions of left inferior frontal cortex have been linked to semantic memory both in terms of the content of conceptual representation (e.g., motor aspects in an embodied semantics framework) and the cognitive processes used to access these representations (e.g., response selection). Progressive non-fluent aphasia (PNFA) is a neurodegenerative condition characterized by progressive atrophy of left...
Patients with ideomotor apraxia (IM) are frequently more impaired in the production and imitation of object-related (transitive) than non-object-related, symbolic (intransitive) gestures, but reasons for this dissociation, and its anatomical underpinnings, remain unclear. Our theoretical model of praxis (Buxbaum, 2001) postulates that left inferior parietal lobe (IPL) gesture representations store...
Patients with frontotemporal dementia (FTD) have sentence comprehension difficulty. We examined the hypothesis that both grammatical and resource factors contribute to their impaired sentence comprehension with a traditional, off-line sentence comprehension task, and an on-line sentence processing procedure that minimizes task-related resources. This was investigated in subgroups of FTD patients with...
We addressed the question of whether Alzheimer's Disease (AD) causes a selective impairment for knowledge of living things. Although we replicated a previous finding that AD subjects name pictures of living things less accurately than pictures of nonliving things, we also failed to observe this selective impairment when we used two new stimulus sets, which more tightly controlled the overall naming...
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