To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 3. Excitatory Roll 50 stimulus The movie shows an example of an Excitatory Roll 50 m-sequence. 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 Download Original Video