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Article Dans Une Revue Brain and Cognition Année : 2006

Hemispheric predominance assessment of phonology and semantics: A divided visual field experiment

Emilie Cousin
Monica Baciu

Résumé

The aim of the present behavioural experiment was to evaluate the most lateralized among two phonological (phoneme vs. rhyme detection) and the most lateralized among two semantic ("living" vs. "edible" categorization) tasks, within the dominant hemisphere for language. The reason of addressing this question was a practical one: to evaluate the degree of the hemispheric lateralization for several language tasks, by using the divided visual presentation of stimuli, and then choose the most lateralized semantic and phonological for mapping language in patients by using fMRI in future studies. During the divided visual Weld experiment by using words (semantic tasks) and pseudo-words (phonological tasks) as stimuli, thirty-nine right-handed participants were examined. Our results have shown that all tasks were signiWcantly left hemisphere lateralized. Furthermore, the rhyme was signiWcantly more lateralized than phoneme detection and "living" was signiWcantly more lateralized than "edible" categorization. The rhyme decision and "living" categorization will be used in future fMRI studies for assessing hemispheric predominance and cerebral substrate for semantics and phonology in patients. Our results also suggest that the characteristics of stimuli could inXuence the degree of the hemispheric lateralization (i.e., the emotional charge of stimuli for words and the position of the phoneme to be detected, for pseudo-words).

Dates et versions

hal-00169565 , version 1 (04-09-2007)

Identifiants

Citer

Emilie Cousin, Carole Peyrin, Monica Baciu. Hemispheric predominance assessment of phonology and semantics: A divided visual field experiment. Brain and Cognition, 2006, 61, pp.298-304. ⟨10.1016/j.bandc.2006.02.005⟩. ⟨hal-00169565⟩
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