Subject: Wnat is the link between positive Emotions and endorphins?

WHat links have been substantianted by research to exist between the 
production of endorphins in the brain and positve emotional reinforcement. 
Specifically is there proof that laughing, hugs, or interaction with 
family and friends stimulates the production of endorphins. There seems to 
be a plethora of research present on medline concerning physical 
stimulation(exercise, sex, etc.)of the organism and production of 
endorphins, but relatively little information concerning endorphin 
production from the mental side.   

Re: Wnat is the link between positive Emotions and endorphins?