Intensity discrimination, temporal integration and gap detection by normally-hearing subjects with weak and strong...

It is unlikely that the overall status of a cochlea and middle ear which produces strong otoacoustic emissions (OAEs), i.e. high-level evoked emissions (EOAEs) and spontaneous emissions (SOAEs), has a generalized effect on peripheral auditory processing if the sensitivity is normal. Current data do not support the hypothesis that a weak OAE profile (low-level EOAEs and no SOAEs) is indicative of subclinical damage to the cochlea. Nevertheless, the ability of a subject to perform some psychoacoustical tasks may be influenced by the interaction between OAEs and test signals. The present experiments investigated the influence of strong or weak OAEs on: (1) intensity just-noticeable differences for pure tones; (2) temporal integration in the vicinity of SOAEs; (3) gap detection thresholds for broad-band noise bursts. The results show that OAEs can influence performance on these psychoacoustical tasks, especially for low-level stimuli with spectral components in the vicinity of high-level SOAEs.