SENSATION AND PERCEPTION
HEARING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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we hear different pitches because different sound waves cause different parts of the nerve cells in the cochlea to fire.
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the rate at which impulses travel up the auditory nerve matches the frequency of the tone being heard.
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high-frequency sounds trigger a wave of activity that peaks near the beginning of the basilar membrane.
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frequent or prolonged stimulation of a sensory receptor causes that receptor to become less sensitive.
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Detailed explanation-1: -Frequency theory: The rate of nerve impulses traveling up the auditory nerve matches the frequency of a tone; enabling us to sense its pitch. Best explains how we sense low pitches. Place theory: links the pitch we hear with the place where the cochlea’s membrane is stimulated. Best explains how we sense high pitches.
Detailed explanation-2: -The frequency theory of hearing proposes that whatever the pitch of a sound wave, nerve impulses of a corresponding frequency will be sent to the auditory nerve. For example, a tone measuring 600 hertz will be transduced into 600 nerve impulses a second.
Detailed explanation-3: -The cochlea is filled with a fluid that moves in response to the vibrations from the oval window. As the fluid moves, 25, 000 nerve endings are set into motion. These nerve endings transform the vibrations into electrical impulses that then travel along the eighth cranial nerve (auditory nerve) to the brain.
Detailed explanation-4: -The temporal theory of pitch perception asserts that frequency is coded by the activity level of a sensory neuron. This would mean that a given hair cell would fire action potentials related to the frequency of the sound wave.
Detailed explanation-5: -Pitch is the response of human ear to sound in terms of its shrillness.