Keywords insect vision sensory-motor integration efference corollary discharge forward model Introduction Perhaps surprisingly, much of the activity in “sensory” brain regions is actually correlated with an animal’s own spontaneous movements.1,2,3 This has been repeatedly discovered in mice,4,5,6,7,8 fruit flies,9,10,11,12 and worms,13 although with smaller effects in primates.3,14,15 Neural activity in sensory brain regions is often most robustly correlated with locomotion, but several...