| Abstract: | Assigned randomly 112 male 18–30 yr olds to 8 groups, with 14 Ss per group. For each of 2 drug conditions (no drug and marihuana), there were 4 motivation conditions. In the 1st motivation group, the Ss were merely given instructions concerning how to perform on each dependent measure. The 2nd motivation group was given the additional instructions to "try as hard as possible" on each measure. The 3rd motivation group could earn a small amount of money, contingent on the performance of the dependent measures. The 4th group could earn a substantial amount of money contingent upon task performance. Time perception, choice reaction time, and a paired-associate memory task were used as dependent measures. Results indicate a significant, detrimental drug effect on all measures and a significant motivation effect on the reaction time measure. Examination of the data suggests that the drug effect occurred because of the ineffectiveness of the motivation manipulation with the marihuana Ss. (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
