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Pairwise behavioral choice tests of prey-like objects in the salamander Plethodon jordani.

The orienting responses toward one of the two competing stimuli (cricket dummies and rectangles differing in size, contrast, velocity or movement pattern) were taken as an indication for the attractiveness of a particular visual feature. Size and velocity appeared to be the dominant features; shape was of lesser importance. Contrast and movement pattern were of intermediate importance, local motion of little importance.

The following paired stimulus presentations are seen:
Fast-moving cricket        vs.        stepwise-moving cricket         (velocity vs. movement pattern)
Large-sized cricket         vs.        rectangle                                 (size vs. shape)
Contrast-reduced            vs.        still-image cricket                   (contrast vs. movement pattern)
Standard cricket              vs.        locally moving cricket        (not modified cricket image vs. velocity and movement pattern).

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