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Three studies are reported that investigated the hypothesis, long held by theorists, therapists, and laypersons alike, that a sense of humor reduces the deleterious impact of stressful experiences. In each study a negative-life-events checklist was used to predict stress scores on a measure of mood disturbance. These studies made use of different measures of subjects' sense of humor, including four selfreport scales and two behavioral assessments of subjects' ability to produce humor under nonstressful and mildly stressful conditions. Hierarchical multiple regression analyses revealed that five of the six humor measures produced a significant moderating effect on the relation between negative life events and mood disturbance. Subjects with low humor scores obtained higher correlations between these two variables than did those with high humor scores. These results provide initial evidence for the stress-buffering role of humor.

All published research examining effects of humor and laughter on physical health is reviewed. Potential causal mechanisms and methodological issues are discussed. Laboratory experiments have shown some effects of exposure to comedy on several components of immunity, although the findings are inconsistent and most of the studies have methodological problems. There is also some evidence of analgesic effects of exposure to comedy, although similar findings are obtained with negative emotions. Few significant correlations have been found between trait measures of humor and immunity, pain tolerance, or self-reported illness symptoms. There is also little evidence of stress-moderating effects of humor on physical health variables and no evidence of increased longevity with greater humor. More rigorous and theoretically informed research is needed before firm conclusions can be drawn about possible health benefits of humor and laughter.

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This research compares the structure and correlates of the Humor Styles Questionnaire (HSQ) and Coping Humor Scale (CHS) in the Chinese context with those of Canadian samples. Chinese translations of the HSQ, CHS, and Symptom Checklist 90 (SCL-90) were administered to 354 Chinese university students (M = 23.4 years of age, SD = 3.6). As in the original Canadian samples, four humor factors were found in the HSQ: Affliative, Self-enhancing, Aggressive, and Self-defeating humor, and one factor was found in the CHS. The HSQ and CHS scale reliabilities in the Chinese sample were generally acceptable. Chinese participants, as compared to Canadian norms, reported significantly lower scores on the HSQ subscales and CHS, particularly on Aggressive humor. No significant gender differences were found on the four HSQ subscales in the Chinese sample, whereas Canadian males reported more use of Aggressive and Self-defeating humor than did females. Although no gender difference was found on Coping humor in the Canadian samples, Chinese males had significantly higher scores on this scale than did females. In both the Chinese and Canadian samples, younger participants reported more use of Affliative and Aggressive humor than did older ones. Affliative, Self-enhancing, and Coping humor were negatively correlated, while Aggressive and Selfdefeating humor were positively correlated with the subscales and General Symptomatic Index of the SCL-90. Regression results indicated that mental health is more strongly related to Self-enhancing, Self-defeating, and Coping humor than Affliative and Aggressive humor. Overall, the findings support the theoretical structure and usefulness of the HSQ and CHS in the Chinese context.

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