アメリカ自然史博物館のインスタグラム(amnh) - 2月11日 12時15分

Did you know rats are ticklish? Adult rats produce ultrasonic calls around 50 kilohertz in response to tickling—a behavior that’s been tested, using what researchers called “manual tickling sessions”—and some suspect there may be a correlation to human laughter. Scientists found that not only did young rats exhibit a strong vocal response to tickling that was similar to “youthful human laughter that typically occurs during play,” but that rats that were isolated and kept away from others actively sought out tickling more frequently. In other words, laughter might just be the best medicine.
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