A computational model of stereoscopic prey capture in praying mantises
Fig 3
Response of real neuron (A, columnar commissural neuron rr160127 from [22]), along with response (C) predicted by the disparity energy model with the receptive field functions shown in B,D for left, right eyes.
Here, due to experimental constraints on recording time, the stimuli were long vertical bars 13° in width, so the receptive fields are obtained only coarsely and as a function of only horizontal position. The receptive fields in both eyes have an excitatory centre (positive weights, blue) and inhibitory surround (negative, red). In the receptive fields fitted to this particular neuron, the excitatory centre is wider in the left eye than the right eye; elsewhere in this paper, we enforced symmetry for simplicity. The fitted threshold here is b = 0 and the output exponent is γ = 2.24; see Eqs (1) and (2). See [22] and its Supplementary Information for a detailed description of how responses are plotted in A and C for the real and model neuron respectively. Briefly, the marginal plots show the responses to monocular bars flashed in left or right eyes. The pseudocolor shows the responses to binocular bars, with the location in left, right eyes given by the location along vertical, horizontal axes. The olive lines mark the azimuthal location of the stimulus and the gray lines its disparity (dashed line indicates infinite simulated distance, or zero disparity). This neuron responded best to a bar flashed at a location corresponding to 2.5cm away on the midline.