Chapter 4 - Sensation and Perception

Chapter 4 - Sensation and Perception - Schacter Gilbert...

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Chapter 4 Sensation and Perception PSYCHOLOGY Schacter Gilbert Wegner
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Sensation - the meaningless output from the senses. - Data Driven, Bottom-up Processing Perception - a meaningful pattern of sensations. - Conceptually driven, top-down processing. Psychophysics - The study of how physical stimuli sensed as psychological sensations.
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Detection Absolute Threshold - the smallest detectable amount of stimulus needed for detection. Signal Detection Theory - Detection of a stimulus depends on its physical energy and on internal factors such as the relative costs and benefits associated with detecting the stimulus. SDT uses two variables: 1. The presence or nonpresence of a stimulus 2. The detection or nondetection by the subject.
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Signal Detection Theory Stimulus No Stimulus Present Present Stimulus Detected Stimulus Not Detected Hit False Alarm Miss Correct Rejection
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Table 4.1 : Approximate Sensory Thresholds ( p. 92 )
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Discrimination Difference Threshold - the minimum detectable difference between two stimuli. Just Noticeable Difference (JND) - The change in a stimulus needed to exceed the difference hreshold. eber’s Law - Change needed for a JND is a onstant proportion of the initial stimulus intensity.
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Biological Properties of the Senses Transduction - the process of transforming physical energy into physiological signals the brain can recognize. Receptors - cells that perform transduction. Sensory Adaptation - Reduced sensitivity to unchanging stimuli over time. Sensory coding - transducing the attributes of a stimulus (intensity, hue, pitch, etc.)
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Sensory Adaptation Sensory adaptation : sensitivity to prolonged stimulations tends to decline over time as an organism adapts to current conditions. stimulus doesn’t change.
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Multitasking Selective attention impairs multitasking when sudden reaction is required. driving and multitaksing: reaction time experiments. more impaired for complex or novel tasks.
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How do we see?????? The human eye transduces the wavelength of light into hue (color) and intensity into brightness.
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Table 4.2 : Properties of Light Waves ( p. 96 )
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Figure 4.2 : Electromagnetic Spectrum ( p. 97 )
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The Human Eye Parts of the eye include the cornea , pupil , iris , and retina . retina
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This note was uploaded on 03/27/2012 for the course PSYC 2305 taught by Professor Steven during the Spring '10 term at Texas A&M University, Corpus Christi.

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Chapter 4 - Sensation and Perception - Schacter Gilbert...

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