Example of a worm receiving optogenetic stimulation of its gentle-touch mechanosensory neurons during the onset of a turn.

Recording is from [19]. Animals express Chrimson in gentle-touch mechanosensory neurons (strain name: AML67). This worm does not reverse in response to stimulation. Stimuli was triggered in closed-loop by the animal’s turn. Green dot denotes the animal’s head. Green line denotes its centerline. Yellow line shows the trajectory of a point midway along the animal’s centerline over the past 10 s. Red indicates area illuminated by red light. (MP4)