Aggregation control in the taste/aggregation paradigm . Flies were placed in the chamber and had to choose between two alternatives to feed (grape juice spot or grape juice/denatonium spot) (see drawing in top panel). The time course of aggregation on the two spots was analyzed with 200 flies. The control for the total aggregated flies (on both spots: grape juice/denatonium plus grape juice) versus the total in the chamber is represented at each time point. We saw no statistically significant differences between the strains.