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fundies-ch7new - PSYCHOACOUSTICS A branch of psychophysics...

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PSYCHOACOUSTICS A branch of psychophysics The study of the relation between: the physical aspects of sound and the psychological experience of sound
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Threshold or Limen Absolute Threshold -- lowest value of stimulus which can be detected Difference Threshold -- smallest detectable change in a stimulus These 2 Thresholds were the primary questions in CLASSICAL PSYCHOPHYSICS Thresholds
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Minimum Audibility Curve-- Plot of threshold of detection (in dB SPL) as a function of frequency Lowest thresholds in 1 to 4 kHz region Thresholds
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The Auditory Response Area Thresholds
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Auditory ResponseArea Range of useable hearing-- from threshold of detection to threshold of feeling/pain Also called the DYNAMIC RANGE OF HEARING Thresholds
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Differential Sensitivity Detecting changes in a stimulus (e.g., how small a change in frequency can you detect) Measured as the jnd - just noticeable difference Diff. Sensitivity//Weber’s Law
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Weber’s Law--A Theory of human differential sensitivity P S/S = k Size of jnd = constant fraction of the stimulus you start with It’s easier to detect small changes in a stimulus if it had a small value to begin with.
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