The movie shows a close-up of part of a racetrack tank during OMR
testing. A visible light filter has been used to remove the stimulus, and
the fish are visualized using infrared light (Sony TRV-9 video camera,
night vision mode). The stimulus is represented below. Initially, a
converging grating brings the fish into the field of view. After 8 s, the
stimulus changes to a rightward-moving grating, and all the fish swim
to the right, out of the field of view. At 18 s, the converging movie
reappears, and the fish return. Playback in Quicktime runs at twice
the actual speed. [Courtesy: Mike Orger]

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