Several computerized performance tests are used to obtain measures of attention, impulse control, time perception, processing speed, reaction time, receptive vocabulary, working memory, evoked potentials, and metrics of sympathetic and parasympathetic nervous system balance. Measures of cognitive fatigue and learning plasticity are also available. Quantitative electroencephalography can obtain the theta/beta ratio with accuracy for state of the art ADD/HD diagnostics. With these assessment tools, we can hone in on diagnostic categories and tailor your child's treatment plan. Repeat assessments allow for refined medication titrations.