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An examination of colour-contingent pattern aftereffects
G K Humphrey1, R Gurnsey, P J Bryden
1Department of Psychology, University of Western Ontario, London, Canada.
Spatial Vision
|January 1, 1994
Summary
Researchers describe a new visual aftereffect, the colour-contingent pattern aftereffect (CCPA). This effect, unlike the McCollough effect (ME), is fleeting and abolished by eye movements during induction.
Area of Science:
- Visual perception
- Psychophysics
- Neuroscience
Background:
- The McCollough effect (ME) is a well-known pattern-contingent color aftereffect.
- Previous research has primarily focused on the ME, leaving other related phenomena less explored.
Purpose of the Study:
- To characterize a novel visual aftereffect termed the colour-contingent pattern aftereffect (CCPA).
- To investigate the properties and compare the CCPA with the established McCollough effect (ME).
Main Methods:
- Induction of the CCPA using specific magenta/black radial and green/black concentric circle patterns.
- Observation of evoked patterns upon presentation of homogeneous colored fields (green and magenta).
- Systematic recording of CCPA characteristics, including duration and susceptibility to eye movements.
Main Results:
- A faint, fleeting pattern image was reliably evoked by homogeneous fields after specific pattern-color inductions.
- The CCPA demonstrated characteristics similar to the ME but was shorter-lasting.
- Unlike the ME, the CCPA was abolished by eye movements during the induction phase.
Conclusions:
- The study successfully identified and described the colour-contingent pattern aftereffect (CCPA).
- The CCPA exhibits distinct properties from the McCollough effect (ME), particularly regarding duration and dependence on eye movements.
- Findings contribute to a broader understanding of pattern-color aftereffects in visual perception.