The task was conducted in the same social discrimination apparatus with a custom-made odor delivery system. The task structure was identical to the social discrimination tasks except that two odor cues (citral (W230308) and 1-butanol (537993); 1:1000 diluted with mineral oil; Sigma-Aldrich, USA) or four odor cues (citral (W230308), 1-butanol (537993), isoamyl acetate (W205532), L-carvone (W224901); 1:1000 diluted with mineral oil; Sigma-Aldrich, USA) were used as stimuli. The odors were presented through a polyurethane tube (1/8 inch diameter) placed 2 cm apart from the nose of the subject mice.
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