PSY 001 Lecture Notes - Lecture 8: Auditory Cortex, Semicircular Canals, Sound

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Published on 13 Aug 2020
Course
Professor
Psych 1
David Nguyen
General Psych
Spring 2018
College of the Sequoias
Conduction Deafness: when the bones connected to the eardrum fail to transmit sound waves
properly to the cochlea
Nerve Deafness: damage to the cochlea, hair cells or auditory nerve
Frequency Principle: concept that a sound wave through the fluid of the cochlea vibrates all the
hair cells, which produce action potentials in synchrony with the sound waves
Tones less than 100 Hz
Ex: 50 hz= makes the hair cells send the brain 50 impulses/second
Low frequency= low pitch
Vibrate hair cells at points farther along the membrane
High frequency= high pitch
Loudness and frequency tell you the relative distances, not absolute distances
Only cue for absolute is reverberation The Auditory Cortex
From the auditory nerve to the primary auditory cortex
Cortex responds to specific frequencies
Sound localization via lounges, arrival time and phase Vestibular Sensation
Direction, tilt, and acceleration of the head
Key role in posture and balance
Hair cells stimulated by otoliths in semicircular canal fluids
Sensation of the body and movement
Detects head movements and compensates with eye movements Cutaneous
Senses
Skin senses
Cold, hot, itchy, pain, etc.
Product of many kind of receptors, each sensitive to a particular kind of information
Pain
Send inhibitory messages to spinal cords, closing pain gates
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Document Summary

Conduction deafness: when the bones connected to the eardrum fail to transmit sound waves properly to the cochlea. Nerve deafness: damage to the cochlea, hair cells or auditory nerve. Frequency principle: concept that a sound wave through the fluid of the cochlea vibrates all the hair cells, which produce action potentials in synchrony with the sound waves. Ex: 50 hz= makes the hair cells send the brain 50 impulses/second. Vibrate hair cells at points farther along the membrane. Loudness and frequency tell you the relative distances, not absolute distances. Only cue for absolute is reverberation the auditory cortex. From the auditory nerve to the primary auditory cortex. Sound localization via lounges, arrival time and phase vestibular sensation. Direction, tilt, and acceleration of the head. Hair cells stimulated by otoliths in semicircular canal fluids. Detects head movements and compensates with eye movements cutaneous. Product of many kind of receptors, each sensitive to a particular kind of information.

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