Twenty MBD children and thirty-eight normal control children were tested for handedness and for lateralization on a Finger Tapping Test. The frequency of nonright handedness in normal children was 16%, whereas it was 60% in MBD children. The significance of this difference was discussed. The "imbalance" hypothesis in regard to the Tapping Test was examined. The hypothesis that "extreme" laterality is more in MBD children than controls was not supported in this study.