PSYCH 1XX3 Lecture Notes - Children'S Book Council Of Australia, Ice Cream Cone, Basilar Membrane

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10 Sep 2013
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Audition Module
Auditory Mechanisms Through Evolution:
oIf a tree falls and there is no one to hear it will it make a sound
that humans can not pick up.
-We know if a tree falls it will produce molecules of condensed air
and sound waves, which can not be interpreted without an
auditory mechanism present.
oA dog whistle produces sound at a very high sound
oHumans can hear 20 – 24 Hz.
The Basilar Membrane
oSounds of Different frequencies are processed at different areas
of the basilar membrane.
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oLonger = being able to distinguish between a wider range of
frequencies.
Sound Waves:
oSound waves are slower than light waves and require some
medium to travel to
oSound waves are initiated by sudden burst of air or vibration.
oThe air particles around the source of the vibration are strongest
and promote a ripple effect.
e.g. such as throwing rock in water.
oThese particles interact with the eardrum .
oA band of compressed air particles causes ear to move inwards
oA band of less compressed air particles causes ear drum to move
outwards.
oThree Aspects of Sine Waves
1. Loudness: Variations in amplitude effects the perception of
loudness.
-Higher waves = louder sounds
-Loudness is measured by dBs
-e.g. Normal Conversation is 60dB, Rock Concert is 120 dB
2. Pitch: Distance between successive peaks
-Measure in Hz, measures one peak to the next.
- Higher peaks = high pitched sound.
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