PSYC 2220 Lecture Notes - Psychophysics, Detection Theory, Power Law
3 Nov 2011
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The dawn of psychophysics: the smallest change in stimulus that can be detected is a constant, as stimulus level increases or decreases, the magnitude of change must proportion of the stimulus increase proportionately to remain noticeable, two-point threshold: Psychophysical thresholds: the minimum distance at which two stimuli (e. g. , two simultaneous, jnd (just noticeable difference) touches) can be distinguished. Trials should be both dim to bright and bright to dim and then find the average of the threshold. Usually the threshold is lower when going dim to bright: method of adjustment: similar to the method of limits, but the participant controls the stimulus directly. Participants usually get frustrated because they never really get a definite sense if they are right or wrong. Psychophysical thresholds: principal describing the relationship between. Resulting sensation magnitude: such that the magnitude of subjective sensation is proportional to the stimulus magnitude raised to an exponent, doctrine of specific nerve energies:
