Samenvatting
A study is presented of the influence of two drugs: amphetamine and Barbiturate, on performance of two tasks. The purpose of the study was to evaluate the effects of two drug treatments on separate and simultaneous performance of two tasks. Results indicate that under single-task conditions, control (and placebo), test persons showed a negative regency bias on the randomization task with more alternations and runs than would be expected of a true random generator.