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The percent of time zebrafish actively swam is significantly decreased by the dot shown from the top and also by the presentation of 1 or 6 zebrafish images. Mean ± S.E.M. are shown. Sample sizes (n) are indicated in the text. White bars represent performance during the pre-stimulus (habituation) period, black bars represent the stimulus period performance and grey bars the post-stimulus period performance. The stimulus type employed is indicated above the bar graphs.
