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Each operant chamber (21.6 cm long × 17.8 cm wide × 12.7 cm high) should be housed within a light-resistant and sound-attenuating box. Each chamber has a pellet receptacle in the center of one wall where food pellets are dispensed via an external pellet dispenser. On either side of the receptacle are retractable levers, and on the opposite wall, a 3 W, 24 V house light.
