PSY280H1 Chapter Notes - Chapter 3: Refractive Error, Lisa Lopes, Thalamus
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PSY280H1 Full Course Notes
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Chapter 3 spatial vision: from spots to stripes. Acuity: the smallest spatial detail that can be resolved. 20/20 for eye doctors, but vision scientists talk about the smallest visual angle of cycle of the grating that we can perceive. Cycle: for a grating, a pair consisting of one dark bar and one bright bar; one repetition of black and white stripes. At the eye doctor: usually 20 feet. Spatial frequency: the number of grating cycles in a given unit of space o visual angle between each pair of. Stripes : ex: 1/0. 25 = 4 cycles per degree: the number of pairs of dark and bright bars per degree of visual angle. Human contrast sensitivity function (csf): a function describing how the sensitivity to contrast) deined as the reciprocal of the contrast threshold) depends on the spatial frequency (size) of the stimulus.
