EFFECTS OF MASKING ON EVOKED OTOACOUSTIC EMISSIONS
诱发性耳声发射的掩蔽

Effect of ipsilateral and contialateral masking on rarefaction click evoked otoacoustic emissions (EOAE) were analyized in 34 normal subjects (48 ears). There were both simultancous and backward masking for ipsilateral cars and only backwand masking for contlalatelal ears.The simultaneous masker was white noise and the backward masker, wide-band noise. At levels of masker below 30 dB SL the simultaneous masking effat was non-significant for the emissions, but significant for behavioural responses, this indicating the limitation of EOAE in representing auditory behaviour. Effed of ipsilateral backward masking on the emissions appeared to be significant at 30 dB SL, effect of contralateral backward masking, at 50 dB SL.Masking thresholds were about 59 and 68 dB SL, aspdrively, for ipsilateral and contralateral barkward masking. The cochlear mechanical nolilinearity or the physiological fedback inhibition which it may exsit within the cochlca Aught have implications for ipsilateral masking. And that the contralateral medial olivo-cochlcar bundle inhibital outer hair cell activity is necessary for the effective explanation of contralateral masking.