Lec16_Audition_Chap10A - Hearing in the Environment (Chap...

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Hearing in the Environment (Chap 10) Jonathan Pillow Perception (PSY 323) The University of Texas at Austin Lecture 16
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but frst… a Few loose ends From Chapter 9. characteristic Frequency coding in the auditory system psychoacoustics cochlear implants
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Threshold tuning curve : A map plotting threshold of a neuron as a function of frequency (threshold = lowest intensity that will give rise to a response) threshold (dB) frequency (kHz) Characteristic frequency - frequency to which the neuron is most sensitive Threshold tuning curves for 6 neurons
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Basic Structure of the Mammalian Auditory System Rate saturation The point at which a nerve fiber is firing as rapidly as possible and further stimulation is incapable of increasing the firing rate
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Rate–intensity function : firing rate of an auditory nerve fiber in response to a sound of constant frequency at increasing intensities
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Figure 9.21 Pathways in the auditory system Cochlear nucleus : first brain stem nucleus at which afferent auditory nerve fibers synapse Superior olive : brainstem region in the auditory pathway where inputs from both ears converge Inferior colliculus : midbrain nucleus in the auditory pathway Medial geniculate nucleus (MGN) : part of the thalamus that relays auditory signals to the cortex MGN thalamus
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Figure 9.22 The first stages of auditory processing begin in the temporal lobe in areas within the Sylvian fissure Primary auditory cortex (A1) : First cortical area for processing audition (in temporal lobe) Belt area : A region of cortex, directly adjacent to A1, with inputs from A1, where neurons respond to more complex characteristics of sounds Parabelt area : A region of cortex, lateral and adjacent to the belt area, where neurons respond to more complex characteristics of sounds, as well as to input from other senses
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Basic Structure of the Mammalian Auditory System Comparing overall structure of auditory and visual systems: Auditory system: Large proportion of processing is done before A1 Visual system: Large proportion of processing occurs beyond V1 Differences: may be due to evolutionary reasons
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This note was uploaded on 02/08/2011 for the course PSY 332 taught by Professor Salinas during the Spring '07 term at University of Texas at Austin.

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Lec16_Audition_Chap10A - Hearing in the Environment (Chap...

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