Testing hearing with the brain-stem evoked response.

The brain-stem electroencephalograph (EEG)-evoked response (BSER) constitutes a reliable and objective method of testing hearing in infants, and in uncooperative, or retarded patients. The procedure is harmless and painless, and involves recording the EEG brain-stem responses to clicks presented by headphones. The patient may be sedated, or even anaesthetized, if necessary. Because of the equipment and time involved, the procedure is not recommended as a routine screening procedure, but constitutes a valuable adjunct to conventional audiological testing, especially in doubtful cases.