Identification of H1 Visual Interneuron in Drosophila by [3H]2-deoxyglucose Uptake During Stationary Flight

High-resolution 2-deoxyglucose (2-DG) neuronal activity labeling is used to identify a visual interneuron in Drosophila by its stimulus-specific uptake of [3H]2-DG during stationary flight in a well-characterized behavioral situation. With a single rotating stripe as visual stimulus a neuron is heavily labeled that has not been described in Drosophila before but is homologous to the extensively studied H1 visual interneuron of larger diptera. Labeling of this cell is inconspicuous in Drosophila if the animal is stimulated with a rotating striped drum.