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Lecture 4 Slides - Review Central Auditory Nervous System...

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Review: Central Auditory Nervous System (1) Graded potential across nerve fiber creates all-or-none action potential. (2) Action potential, directed by nerve fiber’s myelinated axon, releases neurotransmitter substance in the synapse on a neighboring fiber creating a new graded potential. (3) Many-to-one afferent innervation of IHCs provide for frequency specificity while one-to-many innervation of OHCs provide for sensitivity. (4) Complex features of sounds are encoded in neural circuits of nuclei in the ascending pathways of the central auditory nervous system. (5) The development of neural circuitry is highly plastic Auditory Sensitivity and Masking z How good is your hearing? z Is threshold for hearing all or none? z How does noise interfere with speech? z What makes one noise more disruptive than another? z Do loud sounds always produce more interference? Rats Definition of Threshold Are advertisers subliminally controlling our behavior?
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