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Michael Slugocki, Catherine Q. Duong, Allison B. Sekuler, Patrick J. Bennett; Evaluating spatiotemporal interactions between shapes. Journal of Vision 2019;19(4):30. doi: https://doi.org/10.1167/19.4.30.
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© ARVO (1962-2015); The Authors (2016-present)
Spatiotemporal interactions between stimuli can alter the perceived curvature along the outline of a shape (Habak, Wilkinson, Zakher, & Wilson, 2004; Habak, Wilkinson, & Wilson, 2006). To better understand these interactions, we used a forward and backward masking paradigm with radial frequency (RF) contours while measuring RF detection thresholds. In Experiment 1, we presented a mask alongside a target contour and altered the stimulus onset asynchrony between this target–mask pair and a temporal mask. We found that a temporal mask increased thresholds when it preceded the target–mask stimulus by 130–180 ms but decreased thresholds when it followed the target–stimulus mask by 180 ms. Furthermore, Experiment 2 demonstrated that the effects of temporal and spatial masks are approximately additive. We discuss these findings in relation to theories of transient and sustained channels in vision.
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