Lateralization of Speech and Auditory Temporal Processing

Authors:
Pascal Belin;Monica Zilbovicius;Sophie Crozier;Lionel Thivard;Anne Fontaine;Marie-Cécile Masure;Yves Samson
Affiliations:
Service Hospitalier Frédéric Joliot, DRM, CEA, Orsay,France;Service Hospitalier Frédéric Joliot, DRM, CEA, Orsay,France;Service Hospitalier Frédéric Joliot, DRM, CEA, Orsay,France;Service Hospitalier Frédéric Joliot, DRM, CEA, Orsay,France;Service Hospitalier Frédéric Joliot, DRM, CEA, Orsay,France;Marie-Cécile Masure URA CEA/CNRS 2210, Orsay,France;Urgences Cérébro-Vasculaires, La Salpêtrière, Paris, and Service Hospitalier Frédéric Joliot, DRM, CEA, Orsay,France
Venue:
Journal of Cognitive Neuroscience
Year:
1998

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Abstract

To investigate the role of temporal processing in language we monitored asymmetry of cerebral activation in human volunteers using positron emission tomography (PET). Subjects were scanned during passive auditory stimulation with nonverbal sounds containing rapid (40 msec) or extended (200 msec) frequency transitions. Bilateral symmetric activation was observed in the auditory cortex for slow frequency transitions. In contrast, left-biased asymmetry was observed in response to rapid frequency transitions due to relateralization, duced response of the right auditory cortex. These results provide direct evidence that auditory processing of rapid acoustic transitions is lateralized in the human brain. Such functional asymmetry in temporal processing is likely to conextended tribute to language lateralization from the lowest levels of cortical processing.