Supplementary material from "In the corner of the eye: camouflaging motion in the peripheral visual field"
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Most animals need to move, and motion will generally break camouflage. In many instances, most of the visual field of a predator does not fall within a high-resolution area of the retina and so, when an undetected prey moves, that motion will often be in peripheral vision. We investigate how this can be exploited by prey, through different patterns of movement, to reduce the accuracy with which the predator can locate a cryptic prey item when it subsequently orients towards a target. The same logic applies for a prey species trying to localize a predatory threat. Using human participants as surrogate predators, tasked with localizing a target on peripherally viewed computer screens, we quantify the effects of movement (duration and speed) and target pattern. We show that, while motion is certainly detrimental to camouflage, should movement be necessary, some behaviours and surface patterns reduce that cost. Our data indicate that the phenotype that minimizes localization accuracy is unpatterned, having the mean luminance of the background, does not use a startle display prior to movement, and has short (below saccadic latency), fast movements.
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Smart, Ioan E.; Cuthill, Innes C.; Scott-Samuel, Nicholas E. (2019). Supplementary material from "In the corner of the eye: camouflaging motion in the peripheral visual field". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.4785621.v2