Chapter 11: Sound, The Auditory System, and Pitch Perception
Chapter 11: Sound, The Auditory System, and Pitch Perception
Overview of Questions
? What is it that makes sounds high pitched or low pitched?
? How do sound vibrations inside the ear lead to the perception of different pitches?
? How are sounds represented in the auditory cortex?
Pressure Waves and Perceptual Experience
? Two definitions of "sound" ? Physical definition - sound is pressure changes in the air or other medium ? Perceptual definition - sound is the experience we have when we hear
Sound Waves
? Loud speakers produce sound by ? The diaphragm of the speaker moves out, pushing air molecules together ? The diaphragm also moves in, pulling the air molecules apart ? The cycle of this process creates alternating high- and low-pressure regions that travel through the air
Sound Waves
? Pure tone - created by a sine wave ? Amplitude (p) - difference in pressure between high and low peaks of wave
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