A new apparatus for one-way locomotor avoidance without handling

A four compartment box suitable for continued one-way avoidance without interruption and handling for return to a starting compartment was described. Improved learning obtained with it in comparison to the learning when only two adjoining compartments were used as a conventional shuttle box was reported. The significance of this comparison to the question of why more rats fail to acquire the avoidance response in a shuttle box than in a one-way box was discussed.