Psych 101 - Lecture Notes [Section 1: Auditory System]

Intro to Psych	Perspectives	History & People
Epistemology	Bettelheim's Autism	Scientific Method & Experiments
Experimental Termonology	Neurotransmitters	Neurotransmission
Anatomy of the Brain	Split Brain	Brain Imaging
Neural Plasticity	Auditory System	Visual System

Section 1: Auditory System

Cochlea is responsible for Pitch, and the loops (inn in the inner ear are responsible for balance

Low frequency-hearing: 20 hertz
To high frequency can hear 20,000 hertz
Where as dogs hear about 20-40,000 hertz

A nerve has problems firing more than 1000 times per second.. therefore the body uses more than one nerve cell to produce signals faster than 1000 times per second to the brain.

Sound frequency is also coded by spacial location along the organ of Corti (part of the cochlea)

Lower sounds are sensed deeper in the cochlea
Higher sounds are sensed near the entrance/beginning of the cochlea

Middle ear contains 2 muscles – protecting us from loud sounds

When caught off guard, there is no way for these muscles to contract fast enough, therefore there is permanent damage in the cochleae

Vestibular System - Senses Kinesthesis (body position and movement)
two main organs
The Semi circular canals
Odalith - Senses acceleration

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