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Lecture 19

Introduction to Psychology PSYCH1010 Lecture 19

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Department
Psychology
Course
PSYC 1010
Professor
Rebecca Jubis
Semester
Winter

Description
PSYCH1010 Lecture 19 3152012 112900 AM Sensation and PerceptionChapter 4 Sensation the process whereby our sensory organs gather info from the external world stimulation of the sensory organs Perception the process whereby the brain organizes and interprets these sensations so that they have some meaningPsychophysics the study of how physical stimuli are translated into psychological experienceHow much of a stimulus is necessary for you to detect it 1 Absolute Threshold the point at which a person can detect the lowest intensity of light or other sensation 50 of the time 2 Difference Threshold just noticeable difference JND is the smallest difference in stimulation required to discriminate one stimulus from another 50 of the time a Between the Reference stimulus and the b Difference Stimulus extra stimulus to detect stimulus i Webers LawPeople are able to perceive very small changes if the magnitude of the reference stimulus is small but as the magnitude of the reference stimulus increases a greater change is necessary before the difference is perceived 3 SignalDetection Theory proposes that the detection of stimuli is based on a The intensity of the stimulus b Noise any irrelevant and competing stimuli c Decision process or response criterion3 Types of Perceptual Organization 1 Form Perception how stimuli are organized into meaningful patterns on shapes 2 Depth or Distance Perception how we can see 3Dimensions when the retina only records only 2 3 Perceptual Constancies
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