Contribution to peripheral agraphia … a case of post-allographic impairment?

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Abstract
The authors report a case of peripheral agraphia that involved handwriting but not oral or letter-block spelling. The pattern was characterised by production of legible well-formed letters but nonphonologically plausible spelling errors, consistent with an impairment of the transfer of the allographic code to the graphic motor pattern store. The localisation of a deficit at this stage was also supported by the detection of a grapho-motor similarity effect between substituted letters. The methodology applied to analysis of grapho-motor similarity used segmentation of letter strokes based on changes of direction.