This task exploits the rodent’s natural preference for dark environments. In this task the rodent has to choose between responding to obtain a positive reinforcement (entering into a dark chamber) and not responding to avoid an electric footshock (not entering the dark chamber). The latency to refrain from entering into the dark compartment serves as an index of conditioned suppression and the ability to avoid, and allows memory to be assessed.

Four TSE-MCS units are available for both rats and mice.