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Three issues related to impairments within the semantic domain are considered. It is argued that the access failure/degraded store dichotomy remains useful. Problems are shown in the more parsimonious explanations of the visual/verbal semantic processing discrepancies and category-specific effects put forward by Riddoch, Humphreys, Coltheart, and Funnell (this volume).
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Tim Shallice (1988) studied this question.
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