Lateralized interference in finger tapping: initial value differences do not affect the outcome.

Willis and Goodwin, Neuropsychologia 25, 719-724, 1987, have suggested that asymmetric interference observed in dual-task/time-sharing studies may be a statistical artifact of "initial-values" differences and not hemispheric lateralization. In the present study lateralized finger-tapping interference produced by concurrent anagram solution was observed even after the initial right-hand advantage in baseline tapping performance was removed experimentally.