Movie 1.

Roll 33 stimulus The movie shows an example of a Roll 33 m-sequence. The hoverfly would have watched this stimulus at a distance of 6.5 cm, placed perpendicular to the screen, with its center of gaze oriented towards the center of the screen. At this distance the visual stimulus subtended 155 degrees azimuth x 138 degrees elevation.

The impulse response of optic flow-sensitive descending neurons to roll m-sequences

Richard Leibbrandt, Sarah Nicholas, and Karin Nordström

Journal of Experimental Biology 2021. 224:None-None; doi: 10.1242/jeb.242833