Figure 4. Latencies of jumps across the hurdle.

Mean latencies of jumps across the hurdle of the shuttle-box after tone onset are plotted as a function of the training sessions. There are no systematic significant differences of latencies between the experimental groups of animals. At training session 15, R552H mutants are significantly different from WTs and S321X mutants (p<0.05; F = 4.42) and at training session 18, WTs differ from R552H mutants (p<0.05; F = 5.41). At any other training session, significant differences did not occur (F-values<2.50). Standard deviations are shown only for the WTs for better visibility. They are of the same order of magnitude for both groups of heterozygous mutants.