Botox may diminish the experience of emotion

http://scienceblogs.com/neurophilosophy/2010/04/botox_may_diminish_the_experience_of_emotions.php

Botox, which is used by millions of people every year to reduce wrinkles and frown lines on the forehead, works by paralyzing the muscles involved in producing facial expressions. A study due to be published in the journal Psychological Science suggests that by doing so, it impairs the ability to process the emotional content of language, and may diminish the quality of emotional experiences.