His grip is so tight that the whites of his knuckles show; he presses so hard that the indentation goes through three or four sheets of paper? He may even rotate his page by up to 90 degrees. Does the intense concentration he need to simply manipulate his tools hinder his creative process?
This could be the result of the lack of inhibition of the Asymmetrical Tonic Neck Reflex (ATNR), which is one of the primitive reflexes.
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Article by Marion Miller