Lecture 6-Sensation & Perception

Lecture 6-Sensation & Perception - OUTLINE Modules...

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Unformatted text preview: OUTLINE Modules 10, 11, 12 13 SENSATION 1. Sensation vs. Perception 2. Psychophysics 3. Vision 4. Audition NOTE: Read about Touch, Taste, Smell, Balance PERCEPTION 1. Selection Selective attention Bottleneck theory 2. Organization and Interpretation Some Perceptual Illusions Gestalt Psychology Constancy in Perception Perceptual Set Depth Perception Perceptual Adaptation Extra Sensory Perception Experiencing events: 2 Stages Stage 1: SENSATION the processes of : converting the physical world into a mental representation (transduction) and relaying that information to the brain (conduction) EX: of Transductions Variations of light experienced of color Variations of air pressure experienced of sound Stage 2: PERCEPTION the processes of: select, organize, and interpret these mental representations EX: of Selection, Organization an Interpretation We can recognize the color Green We can distinguish Bach from Britney Spears PSYCHOPHYSICS The study of the relationship between physical characteristics of stimuli (energy) and our psychological experiences of them. EX: Light Brightness Sound Volume Pressure Weight Taste Sweetness Key concepts Absolute Thresholds The smallest magnitude of a stimulus that can be reliably discriminated from NO stimulus at least 50% of the time. Remove all the sound from the room and having a watch tick, you could hear it from corner to corner. Difference Threshold The minimum difference between two stimuli that a person can detect at least 50% of the time. o Just noticeable difference Signal Detection Theory Predicts how and when we will detect the presence of a stimulus amidst background stimulation. Complex decision mechanisms are involved to determine if a stimulus exists. PSYCHOPHYSICS Based on both: 1. Stimulus strength 2. Our experiences: expectations, motivation, level of fatigue a. Sounds in my house. Point: Absolute thresholds and Just noticeable differences are not fixed Factors that affect Absolute and Difference Thresholds: 1) chance variation Noise in the system influences sensitivity 2) stimulus intensity Webers Law-The greater the intensity of a stimulus, the larger the difference must be to detect a difference o They must differ by a constant proportion 3) Sensory Adaptation Our sensitivity to a stimulus varies based on experiences. VISION Q: How do we turn light energy (physical stimulus) into vision (psychological experience)?...
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This note was uploaded on 10/19/2011 for the course PSYCH 100 taught by Professor Cave during the Spring '08 term at UMass (Amherst).

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Lecture 6-Sensation & Perception - OUTLINE Modules...

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