Accession Number : ADA136268

Title :   Is Handwriting Posture Associated with Differences in Motor Control? An Analysis of Asymmetries in the Readiness Potential.

Descriptive Note : Interim rept.,


Personal Author(s) : Bashore,T R ; McCarthy,G ; Heffley,E F ; Clapman,R M ; Donchin,E

PDF Url : ADA136268

Report Date : Jan 1982

Pagination or Media Count : 50

Abstract : Levy and Reid's hypothesis that persons who write using the inverted posture have ipsilateral control of distal limb movements, particularly those involved in handwriting, was tested in three experiments in which asymmetries in the readiness potential (RP) were measured. In the first experiment, each subject executed a self-paced repetitive squeeze. Contralaterally larger RPs were recorded from all subjects, irrespective of handwriting posture. In two other experiments, subjects peformed the self-paced squeeze in one condition and wrote a single word repetitively in an analogous condition. Larger RPs were recorded over the contralateral cerebral hemisphere in most inverted-writing subjects in both conditions. Ipsilaterally larger RPs were recorded, however, from some left-handers while writing. These findings suggest that, although control of certain movements may originate from the ipsilateral motor cortex in a small proportion of left-handers, handwriting posture does not index this difference.

Descriptors :   *Psychomotor function, *Psychophysiology, *Performance(Human), Handwriting, Cerebral cortex, Hemispheres, Predictions, Response, Behavior, Laboratory tests, Electroencephalography

Subject Categories : Psychology

Distribution Statement : APPROVED FOR PUBLIC RELEASE