Brain, Vol. 117, No. 6, 1283-1301, 1994
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Functional dissociations following bilateral lesions of auditory cortex
1Département de Psychologie, Université de Montréal Montréal, Canada 2Centre de Recherche du Centre Hospitaller, Côte-des-Neiges, Université de Montréal Montréal, Canada 3Laboratoire de Psychologie Expérimental, Université Libre de Bruxelles Bruxelles, Belgium 4Service de Revalidation Neurologique, Hopital Universitaire Brugmann Bruxelles, Belgium 5Department of Neurobiology, Harvard Medical School and Neurology Service, Massachusetts General Hospital Boston, USA
Correspondence to:
Correspondence to: Isabelle Peretz, Département de Psychologie, Université de Montréal, CP 6128, succ. Centre-ville, Montréal (Québec), Canada H3C 3J7
We present two patients with bilateral lesions of the superior temporal cortex who manifested a number of functional dissociations in the auditory domain. The perception of speech and environmental sounds were preserved; yet, the perception of tunes, prosody and voice was impaired. As the processing of melodic but not rhythmic variations in musical sequences was selectively disturbed, the deficit cannot be attributed to a general impairment in auditory memory or sequential processing. These findings suggest that melody processing is not mediated by a general-purpose auditory architecture but by specialized cortical subsystems residing within the lesioned areas. Current taxonomies of auditory agnosia and models of normal music cognition are evaluated in light of the functional dissociations manifested by these patients.
auditory agnosia; amusia; auditory cortex; voice; prosody
Received February 1, 1994. Revised May 24, 1994. Accepted June 21, 1994.
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