Psychology 1000 Chapter Notes -Psychophysics, Psychophysiology, Retina

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Dr.Mike

Document Summary

Psychophysics: relation between physical stimulus and psychological response. Light stimulates visual system which enables vision (response) Can determine a just noticeable difference (jnd) Threshold: value of a stimulus characteristics required to produce some response, absolute lower limit of perception. Vision: candle flame at 50km. on a dark clear night with no obstructions. Hearing: tick of a watch at 6m. Taste: tsp. of sugar in 8l of water. Smell: 1 drop of perfume in a 6 room apartment. Touch: wing of a fly falling on cheek from 1 cm. Size of difference threshold relative to physical intensity of the test stimulus is constant. If i = 50db and a jnd is reported at 55db c = 5/ 50 = 1/10. 10 i = 100 i = 10: can compare sensitivity of different systems: the smaller the weber constant, the better, a jnd would occur at: New test + 10 = 110 db.