Fig. 1.

Optic flow patterns that elicit the optomotor response. Optic flow lines on the visual hemisphere generated by a lateral translation (sideslip) and b rotational motion (yaw). The visual axis is straight ahead, directly into the page. The faint green lines represent directions 15° apart on the visual hemisphere. Red lines represent the direction of optic flow on the retina. Sketches above each panel depict the mantis head motion that would generate such optic flow. Within the central 60° or so (central black circle), the flow patterns are similar for the two flow types. Flow lines, however, differ in the extreme periphery outside this circle