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Lecture 9

PSY 3108 Lecture Notes - Lecture 9: Superior Olivary Complex, Cochlea, Mnemonic

Course Code
PSY 3108
Sharon Lee

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Lecture 9 Auditory Perception
Class Business More about the Midterm
Midterm Structure:
Roughly 50% multiple choice, 50% short answer
80 minutes long
Material Covered:
Chapters 1,3,4,5, Chapter 6 (adjusted)p.180-183 & p. 190-194 &bottom
p.200 p.203
Lecture slides to today
Formulae: A chart will be provided on the test
Not Tested
Tactile communication p.85-87
Review - Biological mechanisms of auditory processing
Neural capture
Subcortical auditory paths
Auditory cortex
Inferior Colliculus
Receives inputs from many higher areas, such as A1
May be a “switchboard” for regulating auditory attention
Also, an integrating area for multi-modal perceptual responses such as startles reflexes
and reflexive looking.
Descending Pathways
Connections do not only go from ear up to cortex (afferent), but also back down
For instance, olivo-cochlear neurons--going from superior olivary nucleus down to
cochlea--can turn down the gain on IHCs to allow them to process higher sound volumes
Descending connections also cause contractions in small muscles attached to ossicles,
causing them to be less mobile and thus “turning down the volume” on high amplitude
What is the sequence of subcortical nuclei that carries auditory information from ear to
cortex? (Create a mnemonic for CSIMA)
What do the descending (efferent) fibers leading into the cochlea do?
Auditory Areas in the Cortex
Signals from MGN arrive in A1, primary auditory cortex
A1 seems to process relatively simple sound information regarding frequency and
A2 processes more complex aspects of sound
Other areas (Wernicke’s, Broca’s) process speech
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