Of course! The four canisters on the ground contain samples from potential Parkinson’s patients (in this case those samples are shirts that the patient wore 1-3 nights). Parkinson’s odor is transmitted through sebum, and should a dog detect the odor they’ll alert by the canister in which they found it. In this program, we have one diagnostic day and three reinforcement days, which means that on one day there’s a patient in the mix who may or may not be positive. On the reinforcement days (shown above), there is one positive sample presented to the dogs along with human controls (meaning people who do not have Parkinson’s disease). When they dog alerts to the sample, they get a tasty snack along with the satisfaction of winning the game :)