どうして人はツメをかんでしまうのでしょうか。ツメかみの癖がある人を観察していると、読書をしている時、仕事中、受験勉強中、または携帯電話をいじっている時など、どうやら何かに没頭している時にツメをかむようです。ツメをかむという行動には、活発になりすぎた脳の働きを落ち着かせるといった性質があり、ツメをかむ行為自体は無意識的なものだといえます。また、ツメをかまなくても、顔や髪の毛を触わることでも同様の心的効果が得られるようです。心理学ではこのような行為を「自己親密行動」と呼びます。
AI translation, cross-checked between two models.
Why do people bite their nails? Observing people who have a habit of biting their nails, it seems that they tend to do so when they are deeply absorbed in something, such as reading, working, studying for an entrance examination, or using a mobile phone. Nail-biting has the effect of calming brain activity when it becomes overly active, and the act of biting one’s nails itself can be said to be unconscious. Moreover, even without biting one’s nails, touching one’s face or hair seems to produce a similar psychological effect. In psychology, such actions are called “self-intimacy behavior.”
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