Abstract: The disclosure relates to an apparatus and a system for testing the cognitive ability of a rodent, comprising a testing chamber, a retarding zone connected to the entrance chamber and including at least one obstacle configured to slow down the rodent's movement to the entrance chamber, and an optional transfer chamber connected to the entrance chamber via the retarding zone for transfer of the rodent to and from an area external to the apparatus. The testing chamber comprises an entrance chamber, a plurality of corridors each connected to the entrance chamber via a corridor's first end portion, and at least one odor diffuser for diffusing odors in the plurality of corridors.