Inverted and noninverted lefthanders compared on the basis of motor performance and measures related to the act of writing

Abstract

Pen angles, tilt of writing page, head tilt, slant of writing, mirror writing, laterality quotients and familial sinistrality of inverted and noninverted lefthanded writers were measured. Subjects also performed two motor tests. Reliable differences were found only in terms of the pen angles and the tilt of the writing page, measures that define the groups in the first place. It was concluded that technical aspects of writing from the left to the right with the left hand and environmental pressures are important factors in the genesis of the inverted writing position in the lefthander.