Brachycephalization

… Head shape has always been an important trait in anthropology, and there are many statistics on the head index, which is the percentage of head width relative to head length (76-80.9 is mesocephalic, larger is brachycephalic, smaller is dolichocephalic). Since prehistoric times, there has been a general tendency for dolichocephalic people to gradually become brachycephalic, which is evident in Caucasians and Asians, and this is called brachycephalic (brachycephalization). Incidentally, head index is a genetically extremely unstable trait. …

*Some of the terminology that mentions "brachycephalization" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　頭型は人類学でつねに重視されてきた形質で，とくに頭長に対する頭幅の百分率を頭示数(76～80.9が中頭，もっと大きければ短頭，小さければ長頭)に関する統計は充実している。先史時代から長頭がしだいに短頭化する一般的傾向が，白人やアジアの住民で顕著であり，これを短頭化brachycephalizationと呼ぶ。ちなみに頭示数は遺伝的にはきわめて不安定な形質である。…

※「brachycephalization」について言及している用語解説の一部を掲載しています。

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