11centralauditory_2009

11centralauditory_2009 - Auditory System: Central Pathways...

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Unformatted text preview: Auditory System: Central Pathways Cochlea Auditory Nerve Dorsal Cochlear Nucleus Antero Ventral Cochlear Nucleus Postero Ventral Cochlear Nucleus Medial Superior Olive Lateral Superior Olive Lateral Lemniscus Inferior Colliculus Medial Geniculate Cortex Acoustic Stria: Dorsal Intermediate Ventral FUNCTION: Identify and process complex sounds Principal relay to cortex Form full spatial map Locate sound sources in space Start sound feature processing Parallel pathways, each analyzes particular features Streams separate in cochlear nucleus: different cell types project to specific nuclei in a manner somewhat reminiscent of what and where pathways in vision. Cochlea Auditory Nerve Dorsal Cochlear Nucleus Antero Ventral Cochlear Nucleus Postero Ventral Cochlear Nucleus Medial Superior Olive Lateral Superior Olive Lateral Lemniscus Inferior Colliculus Medial Geniculate Cortex Acoustic Stria: Dorsal Ventral FUNCTION: Identify and process complex sounds Principal relay to cortex Form full spatial map Locate sound sources in space Start sound feature processing Intermediate Cochlear Nuclei VIII nerve: branches to innervate the 3 cochlear nuclei in a tonoptopic pattern: Dorsal Cochlear Nucleus Posteroventral CochlearNucleus Anteroventral Cochlear Nucleus Start of feature processing. Distinct cell classes in the ventral nuclei: Stellate Cells preserve stimulus intensity. Bushy Cells preserve stimulus timing. Cochlea Auditory Nerve Dorsal Cochlear Nucleus Antero Ventral Cochlear Nucleus Postero Ventral Cochlear Nucleus Medial Superior Olive Lateral Superior Olive Lateral Lemniscus Inferior Colliculus Medial Geniculate Cortex Acoustic Stria: Dorsal Intermediate Ventral FUNCTION: Identify and process complex sounds Principal relay to cortex Form full spatial map Locate sound sources in space Start sound feature processing phase-lock movie Interaural time-difference ITD effective at low...
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This note was uploaded on 04/18/2010 for the course BISC 421 at USC.

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11centralauditory_2009 - Auditory System: Central Pathways...

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