A unified mechanism for innate and learned visual landmark guidance in the insect central complex
Fig 7
Innate behaviour under the control of a visual reward signal.
Simulations of the FB steering model (Fig 6) using a reward signal provided by the visual processes to modify the EPG-PFL3 synapse weights. We created the visual reward signal to the CX using different masks. Results for each panel include (a) the final path directions (n = 50 simulations), (b) the probability density function of the final direction vector relative to the cue orientation, (c) the averaged EPG-PFL3s synapse weights and (d) examples of 5 simulation paths. See also Fig B in S1 Text for results with continuous masks. A. Visual reward to the FBs is equal to the sum of the visual units signal through a discrete mask equal to 0 outside the 30° frontal area or 1 inside. B. Visual reward to the FBs is equal to the sum of the visual units signal through a discrete mask equal to 0.5 inside the 30° frontal area, -0.5 inside the 30° rear area, or 0 otherwise. C. The mask is shifted by 45° to the left of the visual field. The reward area extends from 30° to 60°. D. The mask is shifted by 45° to the left of the visual field. The reward area extends from -30° to -60°.