PSY280H1 Lecture Notes - Lecture 8: Neural Coding, Sound, Lateral Lemniscus
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PSY280H1 Full Course Notes
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Results from compression of air molecules: pressure changes in medium e. g. air. Intensity depends on the pressure of compression: measured in db. Human can hear from 20 to 28 000 000 micropascals (or 28 pascals: db = 20 log (p/p0) P0: standard pressure: 20 micropascals = 0 db, 200 = 20 db, 2000 = 40 db. Air molecules spread out to ll in increase space. Trough: a single sound wave is pure tone. Frequency (hz: the number of wavelengths that occur in 1 second (measured in hertz (hz, corresponds to pitch: lower frequency indicates lower pitch. Amplitude (db: size of wave, determine loudness: larger amplitude greater loudness, higher amplitude = more compression = more intense sound, increase db. Phase: point in the cycle the wave starts, sound waves in phase. Starts at the same points: sound waves in anti-phase. 2 pure tones in phase: adds up: double intensity.
