Stress has long been known to influence physical health. Visintainer, Volpicelli, and Seligman XXXXXXXXXXinvestigated the hypothesis that rats given 60 trials of inescapable shock would be less likely...

Stress has long been known to influence physical health. Visintainer, Volpicelli, and Seligman (1982) investigated the hypothesis that rats given 60 trials of inescapable shock would be less likely later to reject an implanted tumor than would rats who had received 60 trials of escapable shock or 60 no-shock trials. They obtained the following data: