Lateral preference

Japanese: 左右優位 - さゆうゆうい(英語表記)lateral preference
Lateral preference
The dominance of one hand, leg, etc. over the other. Many parts of the human body are shaped the same on both the left and right sides. For example, the hands, feet, eyes, and ears are paired, with one on each side. These body parts are not always used on both the left and right sides; there are actions and situations in which only one side is used. Take the hands for example, when writing, drawing, or throwing a ball. It is more efficient to use one hand rather than both. In such situations, only the right or left side is used.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
手足などで左右どちらかが他に対して優位であること。人間の身体は左右で同じ形をした部分が多い。たとえば,手,足,目,耳などは左右にそれぞれあって対をなしている。これらの身体部分は,つねに左右両方が使用されるわけでなく,一方だけを使用する動作や状況がある。手を例にとれば,文字を書いたり,絵を描いたり,ボールを投げたりする場合である。両方の手でなく一方の手を使用したほうがより効率がよいのである。このような状況では,右側あるいは左側の一方のみが使われる。

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