Figure 1.
The percent of time zebrafish spent in the bottom third layer of the test tank is significantly altered (decreased or increased) in a stimulus dependent manner. 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. Note the robust increase of time on bottom in response to the bird shown from above and the dot shown from above the test tank.