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Interhemispheric inhibition, intrahemispheric activation, and lexical capacities of the right hemisphere: a
L Querné1, F Eustache, S Faure
1Laboratoire de Psychologie Cognitive et Pathologique, Université de Caen, Caen, France.
Abstract:
This study proposes that the lexical-semantic capacities of the right hemisphere (RH) are underestimated in normal subjects and reexamines them in a "dynamic model" framework. As expected, overloading the left hemisphere by combining a lexical-decision task presented in divided visual field with a concurrent heavy verbal memory load, and activating the RH by combining the lexical-decision task with a concurrent visuo-imaged memory load, lead to enhanced left visual field-RH lexical performance. The RH appears to support a larger lexical-semantic network than suggested in the literature, including representations for long and nonimageable words, and the accessibility threshold for the representations stored therein is modulated by hemispheric activation-inhibition mechanisms.
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