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Chapter 4

Summary of Chapter 4

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University of Toronto St. George
Michael Inzlicht

Chapter 4 Sensation and perception - Sensation: stimulation of sense organs. (i.e. absorption of energy, such as light or sound waves, by sensory organs) - Perception: selection, organization, and interpretation of sensory input. (i.e. translating sensory input something meaningful) Psychophysics - Psychophysics: the study of how physical stimuli are translated into psychological experience. Thresholds: looking for limits - Threshold: dividing point between energy levels that do and do not have a detectable effect. - Absolute threshold: minimum amount of stimulation that an organism can detect. Weighing the differences: the JND - Just noticeable difference (JND): the smallest difference in www.notesolution.com the amount of stimulation that a specific sense can detect. - Webers Law: the size of a JND is a constant proportion of the size of the initial stimulus. - Weber fraction: constant proportion of the initial stimulus. (approximately 130) - As stimuli increase in magnitude, the JND becomes larger. Psychological scaling - Fechners law: the magnitude of a sensory experience is proportional to the number of JNDs that the stimulus causing the experience is above the absolute threshold. - Constant increments in stimulus intensity produce smaller and smaller increases in the perceived magnitude of sensation. (ex. 3 equal increases in stimulus intensity (the amount of light) produce progressively smaller differences in the magnitude of sensation (perceived brightness)) Signal-Detection theory - Signal-detection theory: detection of stimuli involves www.notesolution.com
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