Abstract
A brief overview is given of recent controlled studies of the effects of stimulent drugs on general behavior, motor organizaition, cognition and learning, physiololigical responsiveness and attentions in hyperkinetic children. Emphasis is placed on objective methods of assessment of drug effects which have began to allow standing clinical lore to become documented and to contribute to the understanding of basic psychological and physioloicial process involed in the heterogenous disorders lumped under the label of “hyperkinetics syndrome.”