PSYC 280 Final: CH 6 FOUR SENSES
11 May 2017
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Document Summary
Amplitude: (intensity), its usually measured as sound pressure. Perception of amplitude is termed loudness, expressed as decibels (db), one decibel is the threshold for human hearing, eg a whisper is about 20 db. Frequency: or number of cycles per second. Our perception of frequency is terms pitch, and is measured in hertz (hz), range from 2000-5000 hz. Pure tone: a tone with a single frequency of vibration. Fundamental: the predominant frequency of an auditory tone, or a visual scene. Eg if fundamental= 440 hz, harmonic= 880, 1320, 1760. Timbre: the characteristic sound quality of a musical instrument, as determined by the relative intensities of its various harmonics. Doppler shift: occurs if the emitter is in motion, velocity (speed) is added to the rarefaction-compression cycle to change frequency. Pinna (mammalian distinct characteristic) ear canal (auditory canal) Pinna of mammals come in different shapes for the direction and distance of the source of a sound.
