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Schematic overview of the rat CombiCage. A standard macrolon home-cage is connected to a Med-Associates operant box by a polymer connection tube (diameter 10 cm). The operant box is equipped with a food magazine connected to a pellet dispenser. On the opposite wall five equally spaced cue holes are positioned with yellow LEDs. Each cue hole is equipped with an infrared response detector to measure nose-poke responses
