Spatial and Temporal Visual Masking and Visibility.
Annual rept. 30 Sep 84-31 Mar 86,
NEW HAMPSHIRE UNIV DURHAM VISION RESEARCH LAB
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Studies continue on spatio-temporal interactions between briefly-flashed lines. The delayed facilitation we previously reported suggested that we were tapping a motion-detector system. However extensive experiments which failed to correlate our line interactions with the motion aftereffect and other well-known manifestations of motion detection have convinced us that we are measuring something different. We currently believe we may be tapping the moving-object detectors described by Burr. We have demonstrated that transient stimulation produces a substantial change in the configuration of inhibition and excitation, as revealed by summation between briefly-flashed lines. We have extended our studies of summation between lines to parafoveal vision. Unlike most visual functions, spatial summation in the periphery does not increase in direct proportion to cortical magnification. Based on our studies of summation, we predicted and observed that aliasing, though absent in the fovea, should be present in the parafovea. Studies of velocity discrimination suggest that there do not exist a small numer of discrete velocity detectors, but rather a near-continuum of theses. Keywords Visual targets Moving targets Visual perception.
- Anatomy and Physiology