Tsumekami (English spelling) nail‐biting

Japanese: つめかみ(爪かみ) - つめかみ(英語表記)nail‐biting
Tsumekami (English spelling) nail‐biting
The habit of biting nails. It is a relatively common neurotic habit in children. It usually begins around 4 or 5 years old and is most prevalent between 8 and 10 years old, decreasing thereafter, but it may persist into adulthood. This behavior is thought to be a motor release of psychological tension, as it is seen in situations or settings that cause tension. From a psychoanalytic perspective, it is said to have an aggressive aspect. [Nagashima Masaki] [Nogami Yoshimi]

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
つめをかむ癖。児童の神経症的習癖のなかでは比較的多く認められる。通常4~5歳ころから始まり8~10歳までに多く,それ以降は減少するが,長じても残存することがある。この行動は緊張を強いられるような状況や場面でみられるところから,心的緊張の運動性解放と考えられている。なお精神分析的には攻撃的な面をもつとされる。【永島 正紀】【野上 芳美】

出典 株式会社平凡社世界大百科事典 第2版について 情報

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