During classical training, the lack of contingency between behavioral output and sensory input leads to drifting of the torque baseline over most of the torque range of the fly. Therefore, no spike detection is possible in these phases. For this reason, all comparative studies were restricted to the five test-periods.
All between-group analyses were performed with repeated measures MANOVAs whenever more than one 2 min period were compared at a time. Wilcoxon Matched Pairs Tests were used to test single 2 min periods against zero. Correlational analyses were computed according to Spearman's Rank Order Correlation throughout.