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The optomotor visual assay; diagram (left), photograph (right), close-up (below). A fish aquarium containing two ‘racetracks' is placed above a computer screen. Thirty wild-type larvae are placed in each track. Moving gratings are presented on the screen to the fish larvae through the transparent aquarium. After 90 s of grating presentation, the number of fish in the last one quarter of the track, the target area, is counted and recorded as a proportion of the total number of fish.
