Can left-handed writing posture predict cerebral language laterality?
B. T. Volpe, J. J. Sidtis and M. S. Gazzaniga
In terms of cerebral lateralization of function, left-handed persons
represent a more heterogeneous group than right-handed persons. Some
evidence suggests that left-handed subgroups can be identified on the basis
of the following two types of writing posture: (1) inverted posture that
indicates ipsilateral hemisphere language capability and (2) straight
writing posture that indicates contralateral hemisphere language
capability. A direct test of this hypothesis with an intracarotid
amobarbital sodium injection failed to support these predictions. For
clinical decisions in which the hemisphere subserving language is
necessary, one should rely on direct assessment with the use of the
amobarbital injection technique.