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Chromatic perceptive field sizes change with retinal illuminance.
Michael A Pitts1, Lucy J Troup, Vicki J Volbrecht
1Department of Psychology, Colorado State University, Fort Collins, CO, USA. mpitts@colostate.edu
Journal of Vision
|August 16, 2005
Summary
Chromatic perceptive field size, except for red, shrinks as retinal illuminance increases. Rod influence is considered for these visual perception changes.
Area of Science:
- Vision Science
- Retinal Physiology
- Color Perception
Background:
- Retinal illuminance significantly impacts visual perception.
- Chromatic perceptive field size varies with light intensity and wavelength.
Purpose of the Study:
- To investigate how retinal illuminance affects chromatic perceptive field size.
- To determine the relationship between illuminance, wavelength, and perceptive field size.
Main Methods:
- Used the 4+1 color-naming procedure with monochromatic stimuli (440-660 nm).
- Measured perceptive field sizes at 10 degrees eccentricity after dark adaptation.
- Varied retinal illuminance (0.3-3.3 log td) and stimulus sizes (.098-5 degrees).
Main Results:
- Perceptive field sizes for blue, green, yellow, and saturation decreased with increasing retinal illuminance.
- The perceptive field size for red was the smallest and showed no change with illuminance.
- Results suggest a potential influence of rods on perceptive field size.
Conclusions:
- Retinal illuminance is a critical factor modulating chromatic perceptive field size.
- The invariance of red perceptive field size warrants further investigation.
- Rod and cone pathway interactions likely play a role in these observed effects.