Purpose: The purpose of this study was to examine the characteristics rate and perceptual judgment diadochokinesis (DDK) in typically developing children adults.Methods: Participants were aged 2;6 9;11 normal adults. For DDK tasks, they asked repeat [p*a], [t*a], [k*a], [p*at*a], [p*at*ak*a] accurately quickly with one breath. number repetitions per second measured as for each stimuli. also per...