“…A number of stimulant drug studies (Conners, 1971a;Conners et al, 1969;Conrad et al, 1971;Epstein, Lasagna, Conners, & Rodriguez, 1968;Garfinkel, Webster, & Sloman, 1975;Knights & Hinton, 1969;Millichap, Aymot, Sturgis, Larsen, & Egan, 1968) have included general measures of such functioning. In addition, various specific aspects of perceptual and motoric functioning have been studied by focusing on dependent variables related to perceptual judgments (auditory and visual stimulus discrimination) and vigilance (stimulus detection) (Campbell et al, 1971;Conners & Rothschild, 1968;Conners et al, 1969;Sprague et al, 1970;Sykes, 1969;Werry & Aman, 1975), motor skills (Epstein et al, 1968;Knights & Hinton, 1969;Millichap, et al, 1968), activity level (Christensen, 1975;Cohen et al, 1971;Conners, 1971a;Ellis et al, 1974;Millichap & Boldrey, 196 7 ;Millichap et al, 1968;Routh, 1975;Schleifer, Weiss, Cohen, Elman, Cvejic, & Kruger, 1975;Sprague et al, 1970;Werry & Aman, 1975), and reaction time (Cohen et al, 1971;Kupietz, Camp, & Weissman, 1976;Sykes et al, 1972;Zahn et al, 1975).…”