Abstract
Larvae of tiger beetles (Coleoptera: Cicindelidae) are burrow-dwelling, visual ambush predators which withdraw into their burrows with the passing of large objects. Laboratory experiments confirmed that stimulation of each of the four principal stemmata can elicit escape and that the necessary visual stimulus is contracting, expanding, or transverse movement of a high-contrast image. Response frequency increases as a power function of contrast. Whole-field dimming is ineffective. Movement of large images composed of multiple texture elements, e.g., checkerboards, does not elicit escape, even if each element is much larger than the system's minimum visible angle (4–8° depending upon image contrast). In pilot experiments with a single figure before a textured background, coherent movement of the two inhibits escape, whereas motion in opposite directions does not. Thus, the processing mechanism functions as a feature detector and directs a response to large, single, moving objects.
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Gilbert, C. Visual determinants of escape in tiger beetle larvae (Cicindelidae). J Insect Behav 2, 557–574 (1989). https://doi.org/10.1007/BF01053354
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DOI: https://doi.org/10.1007/BF01053354