PSYCH 1XX3 Lecture Notes - Baby Talk, Auditory Scene Analysis, Gestalt Psychology
19 Sep 2013
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Document Summary
Sound frequency perception in vertebrates: range of frequencies that can be detected vary between species. Humans can perceive sounds that lie between 20 and 20,000 hz. Whales, dolphins and dogs have a higher range. Frogs and birds have a narrower range. Bats and rodents have higher frequency detection. Environmental impacts on auditory structure: audible frequency range is determined in part by the evolution of the structures of the auditory system. Basilar membrane contains hearing receptors; sounds of different frequencies are processed along different areas of the basilar membrane: varies in length across species. Longest in humans allows processing of a wider range of frequencies. Sine waves changes in air pressure over time that make up a sound wave can be graphed as a sine wave: three physical characteristics of a wave translate into three psychological properties. Amplitude: measure of loudness: waves of greater amplitude correspond to vibrations of greater intensity, loudness is measured using a logarithmic scale of decibels (db)
