1. Introduction

2. Animal research

3. Developmental research: A. Evidence that children catch their parents' emotions

B. Evidence that parents catch their childrens' emotions

4. Clinical research: A. Therapists' reaction to clients: i. Clinicians assessment of clients' emotional states: Conscious judgments versus emotional contagion

ii. Do therapists' expectations subtly effect emotional contagion?

B. Psychopathic clients

C. Peoples' reactions to the anxious, depressed, or angry

5. Social psychological research: A. Cross-cultural research: hysterical contagion

B. Experimental social psychological research

6. Historical research: A. The dancing manias of the Middle-Ages

B. The great fear of 1789

C. The New York City riots of 1863

D. Man's inhumanity to man

6. Summing up.