Behavioral experiments involving an odor source were conducted according to a published protocol (17 (link), 48 (link)). Briefly, the odor was diluted in paraffin oil (Sigma-Aldrich, 18512-1L) in glass vials with Teflon caps (Neta Scientific, 5182-0556). Odor dilutions were prepared on a daily basis. Agarose [3% (w/v)] was poured on top of lids of 96-well plates (Greiner Bio-One, 656161). A reinforcement ring (Office Depot, 5722) was placed in the center of a different set of 96-well plate lids. Ten microliters of odor (or solvent for controls) was placed inside the reinforcement ring. The lid containing the odor source was placed on top of the lid with the agarose layer. The odor diffused for 30 s in the dish before a single animal was introduced in the arena below the source. Behavior was monitored using PiVR, which performs real-time tracking as described in previous work (48 (link)). To create virtual odor realities in Fig. 3C, we used a high-powered PiVR setup (48 (link)). Light intensity was measured using a photodiode (Thorlabs, S130VC) connected to a power meter (Thorlabs, PM100D).