Color Vision Sensitivity in Normally Dichromatic Species and Humans
Abstract
Spectral sensitivity functions for large, long-duration spectral stimuli presented on a photopic white background indicate that wavelength opponent mechanisms mediate detection of such stimuli in both normal and dichromatic humans. Normal humans detect the color of spectral flashes at detection threshold intensities, supporting the premise that wavelength opponent processes signal color. However, dichromatic humans do not see some colors at threshold; rather, they require stimuli up to about 0.4 log units above detection intensity. This suggests that dichiomatic humans may have a defect in postre- ceptoral color processing. To test this, we determined color discrimination thresholds in normally occurring dichromats, including the chipmunk, the 13-lined ground squirrel, and the tree shrew.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 23, 2002
- Accession Number
- ADA406727
Entities
People
- Richard E. Van Arsdel
Organizations
- Air Force Institute of Technology