title: Auditory behaviors and auditory brainstem responses of infants with hypogenesis of cerebral hemispheres.
abstract: Three infants with an almost complete absence of the cerebral hemispheres as a result of brain anomalies were studied both audiologically and neurologically. The brain anomalies were diagnosed by means of MRI and CT scans. Behavioral audiometry revealed reactions only to loud sound stimulations but auditory brainstem responses showed wave configurations and thresholds compatible with the ages of the infants. There were significant differences in the thresholds obtained by behavioral audiometry and auditory brainstem responses. It can be considered that these auditorily stimulated behavioral responses are evoked by auditory motor reflexes originating in the brainstem, but not by auditory perception.
authors.affiliation: Department of Otolaryngology, Faculty of Medicine, University of Tokyo, Japan. kimikaga-tky@umin.ac.jp
authors.forename: Kimitaka
authors.initials: K
authors.lastname: Kaga
authors.forename: Takuya
authors.initials: T
authors.lastname: Yasui
authors.forename: Tadashi
authors.initials: T
authors.lastname: Yuge
mesh_terms: D001299:Audiometry; D001307:Auditory Perception; D002648:Child; D002675:Child, Preschool; D016057:Evoked Potentials, Auditory, Brain Stem; D006801:Humans; D006832:Hydranencephaly / Q000503:physiopathology*; D007223:Infant; D008297:Male