Your browser version may not work well with NCBI's Web applications. More information here...
1: Int J Psychiatry Med. 1985-1986;15(1):13-8.Links

Positive emotional states and enhancement of the immune system.

Salivary immunoglobulin A (IgA) concentration increased significantly after subjects viewed a humorous videotape and did not change significantly after they viewed a didactic videotape. Scores on a questionnaire measuring the perceived use of humor as a coping skill were positively related to initial IgA concentration and inversely related to changes in IgA concentration after subjects' viewing of the humorous videotape, which implies a ceiling effect. Enhancement of the immune system may be one link between anecdotal claims of relationships between an individual's being in a positive emotional state and healing.

PMID: 4055243 [PubMed - indexed for MEDLINE]