PSYCH 9A Lecture Notes - Lecture 21: Sound, Low Frequency
14 Jun 2016
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Document Summary
Chapter 4 sensation: hearing, the stimulus: sound. Sound waves: successive pressure variations in the air that vary in amplitude and wavelength. When sound waves hit our ears, they trigger auditory receptors. These receptors turn on neural responses which go to our brain and lad to us hearing this wave can be labeled as a sine wave. Amplitude: the height of a wave crest, amount of pressure exerted by each air particle on the next, measure of sound intensity: we actually measure max pressure achieved. Wavelength: how widely spaced these pressure crests are, a measurement of the distance between one crest and the next, in terms of period: measure how time elapses between one crest and the next. Frequency: the number of wave peaks per second. In sound, frequency governs the perceived pitch of the sound. Sound will be heard louder as amplitude increases.
