PSYC 215 Chapter Notes -Cochlear Nerve, Center Frequency, Absolute Pitch
12 Mar 2014
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Document Summary
Introduction: from the stream of impulses generated by the peripheral auditory system, the brain builds a representation of perceptual attributes for each sound source. Loudness perception: loudness is the perceptual attribute of a sound that corresponds most closely to its intensity. Standard tone is 1khz and 40db spl, subject adjusts 2khz tone until it appears equally loud: this is repeated for a range of comparison frequencies to produce an equal-loudness contour. Loudness scaling: loudness scaling: subjects asked to assign numbers to sounds of different intensities. If a standard tone is assigned as 100, and a second tone is perceived to be twice as loud, it should be rated as 200 (magnitude estimation): this tells us how rapidly loudness scales with intensity. Loudness does not increase linearly with intensity, with exponent 0. 3 in stevens" power law: when magnitude sensation of loudness doubles, sound intensity increases by 10db, sound pressure increases by sqrt(10) = 3. 2 times.
