Capacity to vary writing hand/posture in relation to the Levy and Reid model for control of writing

Inherent in Levy and Reid's (1978) neurological model for the control of writing hand/posture were implications pertaining to the capacity of people to vary their hand/posture when writing. These implications were formulated into the writing variation hypothesis. The skill with which right-normal, left-inverted, and left-normal writers were able to write using hand/postures other than their preferred one was examined. The resulting performance was incompatible with Levy and Reid's neurological model. Whether or not subjects wrote with their preferred hand seemed more important than which posture they used.