CLICK- AND TONE-BURST-EVOKED OTOACOUSTIC EMISSIONS IN NORMAL-HEARING AND HEARING-IMPAIRED EARS

Click-evoked otoacoustic emission (COAE) and tone-bust-evoked otoacous tic emission (TBOAE) input/output (I/O) functions and group latencies were measured in normal-hearing and hearing-impaired ears to determine the extent to which these two types of transient-evoked otoacoustic e missions (TEOAEs) were similar. When stimulus levels measured in 1/3 o ctave bands centered at 500, 1000, 2000, and 4000 Hz were similar, TBO AE and COAE I/O functions were essentially identical in regions of nor mal hearing. This held true in subjects who had normal hearing from 25 0 to 8000 Hz as well as for subjects who had normal hearing across som e frequency ranges but hearing impairment across others. The high degr ee of correlation offers support to the view that both types of transi ent emissions share common generators. There were no significant diffe rences in group delay between TBOAEs measured from normal-hearing and hearing-impaired subjects. (C) 1996 Acoustical Society of America.