Unformatted text preview: Objects appear closer as distance increases. Sound is produced by vibrations carried by air, water, or other mediums. What Happens When You Vary a Sound Wave’s: 1. Height/Amplitude: Loudness 2. Number of Cycles/Frequency: Pitch 3. Mixture of Sound Waves: Quality of sound Humans can perceive pitches from 20 to 20,000 Hz The Basilar Membrane is found in the cochlea of the ear and contains the hair cells that vibrate and transmit impulses to the brain. Pitch Theories: 1. Place Theory: Highest frequency sounds vibrate hair cells near the stirrup end and lower frequency sounds vibrate hair cells at points farther along the membrane. 2. Frequency Theory: A sound wave through the fluid of the cochlea vibrates all the hair cells, which produce action potentials in synchrony with the sound waves. 3. Volley Theory: Groups ( “volleys”) of hair cells respond to each vibration by producing an action potential....
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This note was uploaded on 04/28/2009 for the course PSY 200 taught by Professor Craig during the Spring '08 term at N.C. State.
- Spring '08