1. A method for determining the dominant hemisphere of a human subject comprising: measuring brain signals of said subject utilizing a modified Poffenberger Paradigm of said subject to measure the reaction time and deduce handedness of the subject based on plotting impulses from each of the two hemispheres of the brain of said subject; employing a vectorial view of the role of callosum in the underpinning lateralities of speech and handedness, by obtaining neuronal signals derived from a population of cells devoted to executive function, and categorizing said neuronal signals such that all signals associated with voluntary movements are mapped and said map is analyzed to determine which hemisphere dominates for said subject, whereby the opposite hemisphere of the true handedness of said subject.