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A Measure of Foveal Sensitivity in an Expanded Field of Visual Attention.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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The report measured the effect of a peripheral task on the foveal contrast sensitivity. The foveal sensitivity was measured while subjects were required to simultaneously concentrate on a peripheral task which was placed at eccentricities of 10 degrees, 20 degrees, and 30 degrees along the right horizontal axis. The peripheral task was a sine-wave grating which was generated on an HP-1205A oscilloscope. The foveal contrast sensitivity was measured for 4 angular orientations using 4 spatial frequencies 3, 6, 10 and 20 cycles per degree of sine-wave gratings. All threshold measurements were obtained using the staircase method of psychophysical testing. The staircases for each of the 4 orientations were run concurrently by random selections among these orientations. All stimulus presentations were under computer control. Stimulus presentation times were 20, 50, 100, and 500 msec. The results show that with training, a subjects foveal contrast sensitivity was not affected by a peripheral task.
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