the incremental validity of two metrics of the visual-motor function were tested against a metric of the non-verbal intellectual ability. this aspect has not been tested frequently in research about these constructs. the modified bender gestalt test (bgt-m) was used against the fourth generation of the visual-motor integration test (vmi-4) and the dap:iq test in 154, 4-8 year old students of two public schools. we used multiple hierarchical regression in the visual-motor metric over the intellectual ability test scores, controlling for age. results show that, compared with vmi-4, the visual-motor metric with the bgt-m contains more specific variance, beyond that explained by age, while variance in the visual-motor metric was explained by both metrics alike. the implications of these results for psychological evaluations are discussed.