CONTRIBUTION TO PERIPHERAL AGRAPHIA - A CASE OF POST-ALLOGRAPHIC IMPAIRMENT

The authors report a case of peripheral agraphia that involved handwri ting but not oral or letter-block spelling. The pattern was characteri sed by production of legible well-formed letters but nonphonologically plausible spelling errors, consistent with an impairment of the trans fer of the allographic code to the graphic motor pattern store. The lo calisation of a deficit at this stage was also supported by the detect ion of a grapho-motor similarity effect between substituted letters. T he methodology applied to analysis of graphomotor similarity used segm entation of letter strokes based on changes of direction.