PSYCH 2E03 Lecture Notes - Superior Olivary Complex, Interaural Time Difference, Sound Localization
13 Jun 2013
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Document Summary
Each of the above relay centres has been investigated thoroughly for spectral sensitivity and direction sensitivity. Probable role of each of the major sensory relays cochlear nucleus: Spectral analysis superior olivary nucleus: spatial analysis: Medial determines interaural time difference helpful for sound localization of low frequency sounds lateral determines interaural level difference helpful for localization of high frequency sounds inferior colliculus: integration of spectral and spatial analysis. Attending to particular spatial and spectral cues and top-down auditory signal processing. Major centrifugal feedback connections in the auditory pathways corticofugal outputs to medial geniculate (considering cortex as centre): attention to auditory cues. Olivofugal outputs to outer hair cells (considering superior olivary nucleus as centre): tuning of inner hair cells cochleofugal outputs to stapedius and tensor tympani (considering cochlear nucleus to be the centre): attenuation reflex. Plasticity following monaural deprivation during critical period (rat model) amblyaudia (similar to amblyopia) Auditory acuity depends on binaural and monaural cues.
