Flies were raised on standard cornmeal fly food at 25°C and 70% relative humidity. The following fly lines were used: Gr5a-GAL4, Gr43a-GAL4, Gr64a-GAL4, Gr61a-GAL4, Gr64c-GAL4, Gr64d-GAL4, and Gr64e-GAL4 (ref16 (link)); Gr64fLexA and Gr43aGAL4 (ref13 (link)); UAS-GCaMP3 (ref43 ); UAS-KIR2.1 (ref37 (link)); UAS-TdTomato and UAS-GFP (Bloomington stock center); poxnΔM22-B5 (ref44 (link)); poxn70 (ref 28 (link)).