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A Measurement of the Anisotropic Modulation Transfer Function of the Extrafoveal Human Visual System.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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The anisotropy of the extrafoveal modulation transfer function MTF of the human visual system was measured at angles up to 45 degrees of eccentricity. The stimuli consisted of sine wave gratings of four different spatial frequencies which were presented at four different orientations. The results are presented as a series of plots depicting contrast sensitivity as a function of stimulus orientation and contrast sensitivity as a function of stimulus position in the visual field. The contrast sensitivity of all subjects was found to decrease more rapidly with increased stimulus eccentricity in the superior direction than in the nasal direction. The two predominant anisotropic effects that were observed are designated oblique effect and depressed orthogonal MTFs. Each type is described in detail and its occurrence analyzed. Modified author abstract
APPROVED FOR PUBLIC RELEASE