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Mirror perception in mice: Preference for and stress reduction by mirrors and stress reduction by mirror

  • Author(s): Watanabe, Shigeru
  • et al.
Creative Commons Attribution 4.0 International Public License
Abstract

I measured the amount of time mice spent in a compartment with either a mirror or an opaque screen and found that mice stayed longer in the compartment with the mirror. This finding suggests that mice prefer mirrors. They also showed a preference for the mirror over unfamiliar live mice but did not show a differential preference for the mirror over a familiar live mouse (cage mate). Restraint stress caused hyperthermia (known as stress-induced hyperthermia) in the mice. When cage mates received the restraint stress together, the hyperthermia was reduced. Placement of mirrors instead of the cage mates also showed stress-reducing effects, while restraint with unfamiliar mice did not reduce the hyperthermia. These results suggest that mirrors have familiar cage mate-like social effects in mice.

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