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Western University
Psychology 1000

Sensation Psychophysics Subliminal Perception Visual System What do Weber fractions tell you about sensation? Can we perceive subliminal messages? How does the visual system work? Sensation How do we perceive the world around us? Psychophysics and psychophysiology Psychophysics relation between physical stimulus and psychological response Fechner: “Father of Psychophysics” Can determine a just noticeable difference JND Threshold Value of a stimulus characteristics require to produce some response Absolute: Lower limit Difference: Amount of change for JND Absolute Thresholds Vision: Candle flame at 50km Hearing: Tick of a watch at 6m. Taste: Tsp. of sugar in 8L of water Smell: 1 drop of perfume in a 6 room apt. Touch: Wing of a fly falling on cheek from 1cm Difference Thresholds So what’s the relation E.g. Brightness and perceived brightness Not a 1 to 1 relation Weber’s Law Size of difference threshold relative to physical intesity of test is constant Must know how to calculate on Exam ∆I / I = C If I = 50db and a JND is reported at 55 db 1 / 10 = 5 / 50 = C Note: 1. Can predict other JND’s E.g. Whats a JND @ 100 db ∆I = 10 A JND would occur @ new test + 10 = 110 db OR new test - 10 = 90 db Value of JND not constant The relative difference is... 1. Can compare sensitivity of different systems Vision (Brightness) = 1/60 Kinesthesis (Weights) = 1/50 Pain (Thermal) = 1/30 Audition (Mid. Pitch; Mod. Lou
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