Section 107. Voluntary actions may, by constant repetition, become

quasi-reflex in character. The intellectual phase is abbreviated away.

Habits are once voluntary and deliberated actions becoming

mechanical in this way, and slipping out of the sphere of mind. For

instance, many of the detailed movements of writing and walking

are performed without any attention to the details. An excessive

concentration of the attention upon one thing leads to

absent-mindedness, and to its consequent absurdities of

inappropriate, because imperfectly acquired, reflexes.

Text Book of Biology, Part 1: Vertebrata · 第 47 / 87 章