Food restriction 1 Mice 1 Object discrimination 1 Object memory 1 Object recognition 1 Operant conditioning 1 Whisker trimming 1 animal experiment 1 article clinical trial (topic) 1 darkness 1 diet restriction 1 instrumental conditioning 1 mouse 1 nonhuman 1 perception 1 recognition 1 reinforcement 1 reward 1 vibrissa 1