Psychology 1000 Lecture Notes - Visual Processing, Psychophysiology, Power Law
2 Dec 2012
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PSYCH 1000 Full Course Notes
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Psychohphysics: relation between physical stimulus and psychological response. Gave us methods and comparisons that we can do in order to measure psychological response. Value of a stimulus characteristic required to produce some response. Difference threshold: amount of change for jnd. Hearing: tick of a watch at 6 m. Taste: teaspoon of sugar in 8 litres of water. Smell: 1 drop of perfume in a 6 room apartment. Touch: wing of a fly falling on cheek from 1 cm. I = 1/10 x 100 = 10 db; a jnd would occur at. New test + 10 = 110 db or. New test 10 = 90 db. Hence value of jnd is not constant. Can compare sensitivity of different systems: vision (brightness): 1/60, kinesthesis (weights): 1/50, pain (thermal): 1/30, audition (middle pitch and moderate loudness): 1/10, pressure (skin): 1/7, smell (india rubber): 1/4, taste (salt): 1/3. Fechner"s law: sensation increases with the logarithm of intensity.
