06 Thresholds and Measurement

06 Thresholds and Measurement - 05 Thresholds and...

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05 Thresholds and Measurement I. Threshold – minimum energy needed to cause its detection a. Absolute Threshold – the smallest amount of energy needed to detect any energy at all b. Relative Threshold (Just Noticeable Differences [JND]) – the smallest amount of energy change needed to detect any change c. II. Classical Psychophysical Measurement Techniques a. Method of Adjustment – participants adjust stimulus power (usually on a dial) until the energy is detectable b. Method of Limits – experimenter adjusts stimulus power until either it is detectable (low high power) or undetectable (high low power) starting at random points of power each time i. In this case, the experimenter has control over the stimulus, regulating individual differences in how the stimulus is manipulated ii. c. Method of Constant Stimuli – stimulus intensity is set to different levels and randomly administered, having participants report detection of stimulus on each trial i. In this case, the participant doesn’t know what to expect (cannot anticipate detection)
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This note was uploaded on 04/17/2008 for the course PSC 231 taught by Professor Post during the Fall '08 term at UC Davis.

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06 Thresholds and Measurement - 05 Thresholds and...

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