Contrast Sensitivity of the Human Visual System at One Luminance Level While Adapted to a Stimulus at Another Luminance Level.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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This report documents an investigation of the hypothesis that receptive field organization in the human visual system changes due to a change in stimulus average luminance. Adaptation and testing at the same average luminance produced a depression in the contrast sensitivity curve centered over the adapting spatial frequency. A difference in average luminance between the adapting pattern and the test pattern was expected to produce a spatial frequency shift in the depression of the adaptation curve. Some shift in the adaptation depression was observed indicating that some kind of change in the visual system had occurred, however, the results did not provide sufficient evidence to conclude that a receptive field size change had taken place as a result of the luminance change.
- Anatomy and Physiology
- Human Factors Engineering and Man Machine Systems