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- W1964084492 abstract "The accuracy of toad snapping towards moving worm dummies under various levels of dim illumination (from absolute threshold to “moonlight”) was videorecorded and related to spike responses of retinal ganglion cells exposed to equivalent stimuli. Some toads (at ca. 16 °C) successfully snapped at dummies that produced only one photoisomerization per 50 rods per second in the retina, in good agreement with thresholds of sensitive retinal ganglion cells. One factor underlying such high sensitivity is extensive temporal summation by the ganglion cells. This, however, is inevitably accompanied by very long response latencies (around 3 s near threshold), whereby the information reaching the brain shows the dummy in a position where it was several seconds earlier. Indeed, as the light was dimmed, snaps were displaced successively further to the rear of the dummy, finally missing it. The results in weak but clearly supra-threshold illumination indicate that snaps were aimed at the advancing head as seen by the brain, but landed further backwards in proportion to the retinal latency. Near absolute threshold, however, accuracy was “too good”, suggesting that the animal had recourse to a neural representation of the regularly moving dummies to correct for the slowness of vision." @default.
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- W1964084492 date "1993-06-01" @default.
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- W1964084492 title "Visual performance of the toad (Bufo bufo) at low light levels: retinal ganglion cell responses and prey-catching accuracy" @default.
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- W1964084492 doi "https://doi.org/10.1007/bf00195393" @default.
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