Psychology 1000 Lecture Notes - Lecture 14: Cornea, Retina, Outer Ear

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

Document Summary

Psychophysics: relation between physical stimulus and psychological response. Fechner: father of psychophysics (the way to measure the physics of psychological phenomenon) Can determine a just noticeable difference (jnd: threshold: value of stimulus characteristic required to produce some response. Absolute: lower limit (when sensory systems kick in) Difference: amount of change for jnd (to tell there is a difference) Weber"s law: size difference threshold relative to physical intensity of test is constant. A jnd would occur @ new test + 10 = 110 db or new test 10 = 90 db. If i = 50 db and jnd is reported at 55 db: Value of a jnd is not constant. Concern about the use of subliminal cuts": eat popcorn, buy coke. October 27, 15: can"t see it, we would say it didn"t exist. In general, there is no evidence whatsoever that subliminal cuts influence consumer behaviour. But consider bruce and valentine (1986: priming, used photos to link, 100 msec faster.