PSY100Y5 Chapter Notes - Chapter 4: Middle Ear, Darkroom, Night Vision
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PSY100Y5 Full Course Notes
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Psychophysics study of how physical stimuli are translated into psychological experience. Perception is the selection, organization, and interpretation of sensory input. Just noticeable difference (jnd) the smallest difference in the amount of stimulation that a specific sense can detect. Absolute threshold is simply the jnd from nothing: weber"s law: states that the size of jnd is a constant proportion of the size of the initial stimulus. The constant proportion is called the weber fraction: weber fraction for weights: 1/30. This means you can only tell the difference between 300 grams and 310 grams, not 300 grams and 305 grams. Second light bulb you notice a small difference. Third one you hardly notice anything different: perception can"t be measured on absolute scales. Signal-detection theory: signal-detection theory the detection of stimuli involves decision processes as well as sensory processes, which are both influenced by a variety of factors besides stimulus intensity, hits detecting signals when present.