PSYC 100 Lecture Notes - Lecture 26: Color Constancy, Subjective Constancy, Motion Perception

• School: McGill University
• Department: Psychology
• Course: PSYC 100
• Professor: Jens Pruessner

Document Summary

The brain can perceive motion because it has some neurones that fire when movement occurs. (m. p. a. German who would not see motion, rather just frozen images and snapshots) After effects are strong evidence that motion sensitive neurons exist. The theory behind this illusion combines sensory adaptation with neural specificity. The visual cortex has neurons that respond to movement in a given direction. When we stare at a moving stimulus for a long time, these direction specific neurons begin to adapt and therefore become less sensitive. If the stimulus is removed, the neurones responding to all the other directions are more active. Stroboscopic effect: perceptual illusion that occurs when 2 or more slightly different images are presented in a rapid succession. Wertheimer (gestalt) (1912): 2 images flashed less the 30 ms, were thought to be flashed simultaneously, but at intervals over 200 ms, the 2 lines were seen flashed at 2 different times.