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It would be remarkable, indeed, if handwriting held no message about the function of the brain, whose product it indubitably is. It is as Freud said about impulses in dreams: they cannot be dealt with if they are inspired by alien spirits and considered as foreign to one's own being.
I have long had a passing interest in handwriting. As Lincoln said, "I can never think except with my fingers." It is likely that this state of affairs partly arose because of the overwhelming attention devoted to handwriting in elementary school when I was a boy. A good deal of emotion was stirred up by the rewards and punishments awarded for writing. This was followed in a few years by complete relaxation of any care with it at all, which appears to be the case today. This has given me a modicum of distress as a teacher. In high school
Aring CD. Handwriting: Revelation of Self: A Source Book of Psychographology.. Arch Intern Med. 1971;128(4):641-642. doi:10.1001/archinte.1971.00310220149028