A computational model of stereoscopic prey capture in praying mantises
Fig 10
Testing the response of model and mantids to ghost matches.
Top row shows four different stimulus geometries: (A) a single object 2.5cm distant from the mantis, simulated by disparate objects on a screen 10cm distant, with screen parallax 2.1cm; (B) two objects 10cm distant, 2.1cm apart; (C) as A but with an additional image presented to each eye, with diverging lines of sight meaning that these cannot correspond to any one physical object; (D) single object 10cm distant. Middle row indicates how each of these appear on the screen as viewed by the right and left eye, for the two different disk diameters used. Bottom row: Mean number of strikes elicited per trial for each size and stimulus geometry. Coloured lines: average over 10 trials for each of 18 mantids (not all mantids were tested on the control condition D). Black dots: group average over all mantids; errorbars, ± standard error. Red symbols: mean number of strikes predicted by the model, for horizontal motion (⊳), vertical motion (▽), and for the average of the two (◊).