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Lecture 9

PSY3108 Lecture 9: Lecture 9 – Auditory Perception
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3 Pages
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Winter 2017

Department
Psychology
Course Code
PSY 3108
Professor
Sharon Lee
Lecture
9

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Lecture 9 Auditory Perception
Class Business More about the Midterm
Midterm Structure:
Roughly 50% multiple choice, 50% short answer
NO ESSAY QUESTIONS
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
P.171-173
Tactile communication p.85-87
Review - Biological mechanisms of auditory processing
Transduction
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
(efferent)
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
sounds
Questions
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
location
A2 processes more complex aspects of sound
Other areas (Wernicke’s, Broca’s) process speech
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Description
find more resources at oneclass.com Lecture 9 – Auditory Perception Class Business – More about the Midterm  Midterm Structure:  Roughly 50% multiple choice, 50% short answer  NO ESSAY QUESTIONS  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 • P.171-173 • Tactile communication – p.85-87 Review - Biological mechanisms of auditory processing  Transduction  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 (efferent)  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 sounds Questions  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
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