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Mice were trained to distinguish between arrays of stimuli displayed on a touch screen in an operant chamber. (A) Three stimulus arrays were used during the experiments. (i) Mice were initially trained with an intermediate separation between stimuli for task training. Thereafter, animals started probe sessions with big (ii) and small (iii) stimulus separation conditions. (B) Mice were housed with or without a running wheel. (C) Timeline of the study.
