Biases in turn initiation after unilateral antennectomy. Pairs of flies freely interact in darkness. When one (receiver) fly initiated a turn, we calculated the relative heading (see cartoon) toward the other (stimulus) fly, if the turn was within cVA detection range. For both female and male receiver flies, the right antenna was cut (“ablation,” right), or the right non-olfactory arista was cut (“control,” left). Polar histograms are plotted with the vector median (red line): females: control = 13.7°, ablation = 38.8° (n = 32 per condition); male: control = 2.7°, ablation = 23.9° (n = 48 per condition). The median direction of the groups significantly differs in both sexes.
