Oct 25 - Sensation

Oct 25 - Sensation - Tuesday, October 25, 2011 Sensation...

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Tuesday, October 25, 2011 Sensation Psychophysics Subliminal Perception Visual System Next Time: More Vision Scan: p. 150-158 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? o Measurement of internal sensory experiences o Neural mechanisms required to do that Psychophysics: relation between physical stimulus & psychological response Light – eye – vision (physical stimulation vs. psychological perception) Fechner: “Father” of Psychophysics Can determine a just noticeable difference o JND Threshold: Value of a stimulus characteristic required to produce some response o Physical measure of stimulus intensity in some kind of domain Absolute: Lower limit o Point at which the sensory system turns on and starts responding Absolute Thresholds Vision: Candle flame at 50 km (most sensitive) Hearing: Tick of a watch at 6 m (2 nd most sensitive) Taste: Tsp. of sugar in 8 L of water Smell: 1 drop of perfume in a 6 room apartment Touch: Wing of a fly falling on cheek from 1 cm Threshold: 1
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Oct 25 - Sensation - Tuesday, October 25, 2011 Sensation...

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