PSYC100 Lecture Notes - Lecture 7: Subjective Constancy, James Vicary, Parallax
Document Summary
Computational approach: attempt to imitate perception with computer programing to work out what computations are made in the nervous system. Computers have trouble matching humans in speed and accuracy. Constructivist approach: belief that perception comes from the use of sensory information and cognitive processes (e. g. , knowledge gained through experience and learning) Ecological approach: belief that perception derives directly from sensation. Absolute thresholds: the amount of stimulation required for detection: no absolute cut off, half way between always detected and. 1 teaspoon of sugar in 7. 5 litres of water. One drop of perfume in a six-room apartment never detected. Touch wing of a fly falling on cheek from 1cm. Just noticeable different (jnd) smallest difference detectable. Webers"s law size of jnd proportional to size of initial stimulus. The smaller the initial stimulus the less change needed to detect a difference. The larger the initial stimulus the greater the change needed to detect a difference.
