The ability of an individual to recognize [writing] on the skin (such as on the palm of the hand) purely by sensation of touch.


This ability is examined to test a neurological condition. To test this ability, the examiner writes single numbers or letters on the palm with the back of a pen, pen light, tongue depressor, etc. Positive results indicate normal condition whereas negative results indicate non-normal condition.

Word origin: from Greek grapha ("writing") and aisthesis ("perception").

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