AbstractThe present study was designed to extend Turner and Simons' (1974) investigation of possible experimental artifacts in aggression research. Employing a 2 × 2 × 2 factorial design, 60 male subjects were given either a low or high evaluation apprehension treatment, and then were either exposed or not exposed to weapons in an otherwise close replication of the seven shock‐unassociated weapons condition of Berkowitz and LePage (1967). Based on an objectively worded postexperimental questionnaire, subjects were classified as being aware or not aware that the procedures were designed to make them give more shock to their partners. The findings, which were consistent with the analysis of Berkowitz (1974) and Turner and Simons (1974), indicated that the weapons‐no weapons comparison was significant only for non‐apprehensive, nonaware subjects. The results were interpreted as suggesting that evaluation apprehension, hypothesis awareness, and sophistication in aggression experiments may produce inhibitions which can modify the effects of experimental manipu