Spatiotemporal contrast sensitivity and visual field locus

doi:10.1016/0042-6989(83)90008-1

Vision Research

Volume 23, Issue 10, 1983, Pages 983-989

https://doi.org/10.1016/0042-6989(83)90008-1 Get rights and content

Abstract

Contrast sensitivity, measured as a function of retinal eccentricity for stimuli differing in temporal and spatial frequency (0.25–9 c/deg; 0–16 Hz, 0–12° eccentricity), was maximum at the fovea and declined linearly with eccentricity. The slope of the decrease depended upon spatial but not temporal frequency. Contrast sensitivity for drifting gratings was approximately twice that for sinusoidal counter-phase gratings at all eccentricities. For central viewing log contrast sensitivity increased with grating length. The shape of this function was systematically related to spatial frequency but independent of temporal frequency, indicating that the visual field is homogeneous in sensitivity for change in contrast over time. The implications of these findings for mechanisms of threshold vision in fovea and periphery are discussed.

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Citation Excerpt :
Unlike earlier visual areas, we found that contrast sensitivity at 20 Hz in hV4 was relatively invariant across eccentricity. This finding is more similar to psychophysical sensitivities from our own and other behavioural studies that report little difference in temporal contrast sensitivity across visual space (Koenderink et al., 1978; Virsu et al., 1982; Wright and Johnston, 1983). Next, we aimed to examine the relationship between psychophysical performance and fMRI signals driven by 20 Hz stimuli.
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: A preliminary account of these findings was presented to the5th European Conference on Visual Perception, Leuven, Belgium.

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Spatiotemporal contrast sensitivity and visual field locus

Abstract

Vision Res.

Vision Res.

Vision Res.

Vision Res.

Vision Res.

Vision Res.

Vision Res.

Vision Res.

Am. J. Ophthal.

Vision Res.

Vision Res.