“…This device yields a score for seat movements made by the child while completing a given task. All but one (Christensen, 1975) of the studies which used the device reported significant reductions in seat movement activity during stimulant drug treatment Ghristensen and Sprague, 1973;Sprague et al, 1970;Sprague and Sleator, 1973;Sroufe et al, 1973;Werry and Aman, 1975). However, in a study in which hyperactive children were required to sit in a ballistograph chair (McConnell ei al, 1964), no drug effects on this type of seat activity were observed.…”