The exact cause is unknown. But in a recent study, an experimental drug showed signs of halting the disorder in laboratory mice.
VOA: special.2010.05.19
Psychologist Jonathan Rottenberg at the University of South Florida says they wanted to study crying as it happens in everyday life, not in a laboratory.
VOA: special.2009.01.28
The study used brain images taken at Brookhaven National Laboratory in New York State.
VOA: special.2009.09.29
A laboratory was created to study recently discovered opiate receptors in the brain.
VOA: special.2009.02.10
"The critical part at the end of whatever the level of study you are going to do is to get yourself involved in something that puts you into a laboratory."
VOA: standard.2010.05.10
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