PSYB65H3 Chapter Notes - Chapter 10: Basilar Membrane, Sound, Hair Cell
29 Jan 2017
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Chapter 10: how do we hear, speak, and make. Sound waves - mechanical displacement of molecules caused by changing pressure. Number of cycles a wave completes in a given time. Measured in cycles per second, called hertz (hz) We can perceive sound waves only in the limited range of frequencies. The range of sound wave frequencies heard by different species varies. Describes the intensity and loudness of a sound. Prolonged exposure to sounds louder than 100 db can damage hearing. Sound wave with a single frequency wave are pure tones. Sound mix waves frequencies together in combinations are complex tones. A person can perceive more than one sound simultaneously because each frequency of change in air pressure (each different sound wave) can stimulate different neurons in one"s auditory system. Individuals tend to hear variations of a sound as if they were identical, even though the sound varies from one context to another.
