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In semantic dementia (SD), there is a correlation between performance on semantic tasks such as picture naming and lexical tasks such as reading aloud. However, there have been a few case reports of patients with spared reading despite profound semantic impairment. These reports have sparked an ongoing debate about how the brain processes conceptual versus(More)
What is the underlying representation of lexical knowledge? How do we know whether a given string of letters is a word, whereas another string of letters is not? There are two competing models of lexical processing in the literature. The first proposes that we rely on mental lexicons. The second claims there are no mental lexicons; we identify certain items(More)
Current views of semantic memory share the assumption that conceptual representations are based on multimodal experience, which activates distinct modality-specific brain regions. This proposition is widely accepted, yet little is known about how each modality contributes to conceptual knowledge and how the structure of this contribution varies across these(More)
Pick's disease is a degenerative brain illness characterized by progressive atrophy of frontal and temporal cortex. The temporal atrophy starts from the pole and progresses backward toward modality-specific areas, producing a collection of behavioral symptoms called semantic dementia (SD), including impaired object/picture naming, word-picture matching,(More)
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