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One part of the auditory pathway is specialized for recognition of sound source spatial location. We studied binaural neurons (gathering inputs from both ears) in this part of the auditory pathway. General property of auditory neurons is their adaptation after the onset of stimulus. One particular phenomenon of binaural adaptation in normal hearing subjects is a decline of location accuracy in continuation of the stimulus. Laback and Majdak found the same phenomenon also in subjects with binaural cochlear implants (CI). Surprisingly, they also found that the randomized input pulse train with binaurally correlated time jitter abolishes this phenomenon. However, they did not attempt to explain the neural mechanism of this phenomenon. The purpose of our model presented in the poster is to explain the neural coding substrate of these psychophysical observations in the group of cochlear implantees. |
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