PSYB51H3 Chapter Notes - Chapter 10: Sound Localization, Interaural Time Difference, Inverse-Square Law
15 Apr 2015
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Having 2 ears is crucial for determining auditory locations. First 2 auditory localization cues: even though sound travel fast, pressure waves don"t arrive at both ears at same time. Sounds arrive sooner at the ear closer to the source: intensity of a sound is greater at the ear closer to the source. Interaural time difference (itd): difference in time between a sound arriving at one ear versus the other. As info moves upward though the system, with every additional synapse the timing between the 2 ears is likely to become less precise. Medial superior olives (msos): relay station in the brain stem where inputs from both ears contribute to detection of the interaural time difference: it is the place in the auditory system where inputs from both ears converge. 1: firing rates of neurons in the msos increase in response to very brief time differences between inputs from the two ears of cats.
