PSYCHOACOUSTICAL DEFICITS RELATED TO BILATERAL SUBCORTICAL HEMORRHAGES - A CASE WITH APPERCEPTIVE AUDITORY AGNOSIA

We report a case of acute deafness secondary to bilateral hemorrhages involving the external capsule and extending to both temporal isthmi. The lesions probably disrupted both auditory radiations. Deafness disappeared within 2 weeks leading to a transient auditory agnosia for environmental and verbal sounds. Performance on audiological and neurolinguistic tests were consistent with the hypothesis of a deficit of non specific auditory processes. Psycoacoustical deficits related to subcortical lesions are very rare and might differ from those due to cortical lesions by the lack of aphasia. The present case and both previous cases with subcortical lesions might suffer from auditory agnosia of apperceptive type. Its characterics and the role of non-specific auditory processes are discussed using the data obtained from this third case.