The effects of amphetamines upon judgments and decisions
- 66 Downloads
D-amphetamine sulfate, dl-amphetamine sulfate, and placebo were orally administered to 93 college student volunteers who served as their own controls in a Latin Square design. Dosages were adjusted to the two-thirds power of body weight with the proportionality constant set for 14 mg/70 kg with each drug. Effects were measured upon performances in a mathematical reasoning test, upon self-appraisals of these performances, and in a task which attached monetary payments to the accuracy of self-appraisals (“Decision Score”). The objectives of this research were (1) to reassess the biases in performance self-appraisals reported by Smith and Beecher (1964), and (2) to determine whether these biases represent mere verbal expansiveness or whether they are reflected by changes in decision behavior.
Smith and Beecher's effect upon self-appraisals was confirmed (at p<.02). Decision Score also was affected (at p<.01) in the predicted direction. Performance scores were not significantly affected.
KeywordsSulfate Placebo Body Weight College Student Amphetamine
Unable to display preview. Download preview PDF.
- Hurst, P. M.: The effects of d-amphetamine on risk taking. Psychopharmacologia (Berl.) 3, 283–290 (1962).Google Scholar
- -, and M. F. Weidner: Drug effects upon performance under task-induced stress. Institute for Research (State College, Pa.), Report No. ONR-H-66-3. 1966.Google Scholar
- Smith, G. M., and H. K. Beecher: Amphetamine, secobarbital, and athletic performance. II. Subjective evaluations of performances, mood states, and physical states. J. Amer. med. Ass. 172, 98/1502–110/1514 (1960).Google Scholar
- — —: Drugs and judgment: Effects of amphetamine and secobarbital on self-evaluation. J. Psychol. 58, 397–405 (1964).Google Scholar
- Somerville, W.: The effect of Benzedrine on mental or physical fatigue in soldiers. Canad. med. Ass. J. 55, 470–476 (1946).Google Scholar