The Effect of Lysergic Acid Diethylamide (L.S.D.) on Size Constancy Canadian Psychiatric Association Journal October 1, 1959 T. E. Weckowicz 3 citations 1. An experiment of size constancy has been carried out on 18 volunteers who took 35 gamma of L.S.D. 2. The subjects served as their own controls. 3. The effect of L.S.D. was an increase of the variability of performance of each individual. DOI: 10.1177/070674375900400409 (opens in new tab)