psyc4 - Sensation and Perception Sensation - process of...

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Sensation and Perception Sensation - process of gathering information about the environment Perception - process by which brain organizes and interprets sensory information two sides of the same coin Perception - active process Ambiguous figures
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Demonstration of Perception vs. Sensation
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Basic Principles Three principles: No one-one correspondence between physical and psychological reality Sensation and perception are active processes Sensation and perception are adaptive
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Common Features of Sensory Systems Sensory receptors translate physical stimulation into neural signals - transduction Light, sound waves, heat, vibration Minimum energy required to activate the system - threshold Sensitive to change in stimulation (adaptation to constant input)
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Specialization for Modality Sensory receptors - tuned to a particular form of energy Auditory receptors in ear code sound pressure, not light
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Thresholds Minimum amount of energy to activate sensory system ( absolute threshold ) Just-noticeable difference (JND): minimum difference in stimulation that is just noticeable Weber - JND is a fraction of original stimulus intensity “Weber” fraction is different for different senses
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Signal Detection Theory Studying choice behavior Two-choice discrimination Manipulate cost and benefit of different behaviors Assess Sensitivity -- perceptual acuity Bias -- over-selection of a response
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This note was uploaded on 03/20/2008 for the course PSYC 1101 taught by Professor Crystal during the Spring '08 term at UGA.

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psyc4 - Sensation and Perception Sensation - process of...

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