Abstract
The hypothesis that the two cerebral hemispheres are specialized for processing different visual spatial frequencies was investigated in three experiments. No differences between the left and right visual fields were found for: (1) contrast-sensitivity functions measured binocularly with vertical gratings ranging from 0.5 to 12 cycles per degree (cpd); (2) visible persistence durations for 1- and 10-cpd gratings measured with a stimulus alternation method; and (3) accuracy (d’) and reaction times to correctly identify digitally filtered letters as targets (L or H) or nontargets (T or F). One significant difference, however, was found: In Experiment 3, a higher decision criterion (ß) was used when filtered letters were identified in the right visual field than when they were identified in the left. The letters were filtered with annular, 1-octave band-pass filters with center spatial frequencies of 1,2,4,8, and 16 cpd. Combining four center frequencies with three letter sizes (0.5°, 1°, and 2° high) made some stimuli equivalent in distal spatial frequency (cycles per object) and some equivalent in proximal spatial frequency (cycles per degree). The effective stimulus in the third experiment seemed to be proximal spatial frequency (cycles per degree) not distal (cycles per object). We conclude that each cerebral hemisphere processes visual spatial frequency information with equal accuracy but that different decision rules are use
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These experiments were supported in part by grants to L. O. Harvey, Jr., from the National Science Foundation, the Army Research Institute, the Biomedical Research Support Grant Program, National Institutes of Health, and Colorado Video Incorporated, Boulder, Colorado. Some of these results were reported at the Rocky Mountain Psychological Association meeting in Albuquerque, NM, April 30, 1987, and at the Twentieth Annual Mathematical Psychology Meeting, Berkeley, California, August 8,1987.
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Peterzell, D.H., Harvey, L.O. & Hardyck, C.D. Spatial frequencies and the cerebral hemispheres: Contrast sensitivity, visible persistence, and letter classification. Perception & Psychophysics 46, 443–455 (1989). https://doi.org/10.3758/BF03210859
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DOI: https://doi.org/10.3758/BF03210859