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The auditory brainstem response (ABR) is an auditory evoked potential extracted from ongoing electrical activity in the brain and recorded via electrodes placed on the scalp. The resulting recording is a series of vertex positive waves of which I through V are evaluated. These waves, labeled with Roman numerals in ''Jewett'' and ''Williston'' convention, occur in the first 10 milliseconds after onset of an auditory stimulus. The ABR is considered an ''exogenous response'' because it is dependent upon external factors. The auditory structures that generate the auditory brainstem response are believed to be as follows:〔 *Wave I through III – generated by the auditory branch of cranial nerve VIII and lower brainstem *Wave IV and V – generated by the upper brainstem ==History of ABR== In 1967, ''Sohmer'' and ''Feinmesser'' were the first to publish ABRs recorded with surface electrodes in humans which showed that cochlear potentials could be obtained non-invasively. In 1971, ''Jewett'' and ''Williston'' gave a clear description of the human ABR and correctly interpreted the later waves as arriving from the brainstem. In 1977, ''Selters'' and ''Brackman'' published landmark findings on prolonged inter-peak latencies in tumor cases (greater than 1 cm). In 1974, ''Hecox'' and ''Galambos'' showed that the ABR could be used for threshold estimation in adults and infants. In 1975, Starr and Achor were the first to report the effects on the ABR of CNS pathology in the brainstem.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Auditory brainstem response」の詳細全文を読む スポンサード リンク
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