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Sensation.doc

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Department
Philosophy
Course
Philosophy 1020
Professor
Mark Cole
Semester
Fall

Description
1. SENSATION Psychophysics 1. Detection – presence of stimuli 2. Discrimination – difference between stimuli 1. Detection - absolute thresholds 2. Discrimination - Weber (1800’s) - just noticeable difference (jnd) - intensity change/intensity = constant (Weber’s Law) - Weber Fractions 2. VISION The Stimulus - amplitude (intensity) = brightness - wavelength (frequency) = color (hue) - 360 to 750 nanometers (visible spectrum) Detecting the Stimulus - Cornea, pupil in iris, lens, retina - rods (brightness) – periphery of retina - cones (color + detail) – center of retina - horizontal, bipolar, amacrine and ganglion cells, optic nerve, feature detectors Coding the Stimulus - trichromatic theory - opponent-process theory - dual-process the
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