Psychology 1000 Lecture Notes - Lecture 12: James Vicary, Psychophysics, Power Law

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

Document Summary

Psychophysics: relation between physical stimulus & psychological response. Can determine a just noticeable difference (jnd) Value of a stimulus characteristic required to produce some response. Amount of change for just noticeable difference (how much change required to notice there is a difference) Size of difference threshold relative to physical intensity of test in constant. =c (eg. of i = 50 db, and jnd reported at 55 db, Value of jnd is not constant but the relative difference is. We can predict other jnd"s when we have the constant. Sensation increases with the logarithm of intensity. More predictive across a variety of sensations. Concern about the use of subliminal cuts . In general, no evidence that subliminal cuts influence consumer behaviour. Primined photos with subliminal pictures, made reactions fasters when picking out the next related photo. 30 msecs exposure to logo (apple or ibm) People exposed to apple logo were more creative when thinking up ways to use a brick after.