An Experimental Study of Spatial Frequency Adaptation Effects in the Human Visual System.
Abstract
This report documents an investigation of a hypothesis, based on a receptive field model of the visual system, proposing that the receptive field organization changes in response to a change in the average luminance of the visual stimulus.Foveal measurements of sinusoidal spatial frequency contrast sensitivity over the range of 2 to 10 cycles per degree were made using a two period forced choice stimulus. Measurements were made at one luminance level while subjects adapted to a 6 cycle per degree sinusoidal grating of the same or different average luminance. The two luminance levels used were 3.50 and 35.0 ft. lamberts. Testing with adaptation at the same luminance produced a depression in the contrast sensitivity centered over the adapting spatial frequency. Adapting with a different average luminance level failed to produce a shift in this depression.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1979
- Accession Number
- ADA080421
Entities
People
- William A. Clemens
Organizations
- Air Force Institute of Technology