Psychology 1000 Lecture Notes - Lecture 14: Retina, Visual Cortex, University Of Manchester

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

Document Summary

Psychophysics looks at relation stimulus and psychological response. Can determine a just noticeable difference (jnd: treshold. Value of a stimulus characteristic required to produce some response. Absolute: lower limit (vision, hearing, taste, smell, touch) Difference: amount of change for jnd (ex. How much do you need to turn the lights up to notice the change) Not a 1 to 1 relation (not perfect linear relationship: weber"s law (know the formula!) Size of difference threshold relative to ohysical intensity of test is constant. Sensation increases with the logarithm of intensity. S = k log i: steven"s power law (fits most of data, best fit for stimulus sensation) More predictable across a variety of sensations: subliminal perception. Concern about the use of subliminal cuts. In general, there are no evidence that subliminal cuts influence consumer behavior. But consider bruce and valentine"s (1986) study. 30 msec exposure to apple logo and ibm logo.