Acting Expressions
Acting is very difficult; you have to imitate the emotions of the person you are acting, doing that accurate is extremely difficult. In early times expressions were imitated by masks, but then voices could not be imitated. Nowadays, actors have to do everything themselves, both voices and facial expressions.How hard actors try to do it, it will never be perfect. Researchers studying facial expressions always study them from real tv, not from movies. This is also the reason the autors of this site took their expression movies from shows like Jerry Springer, etc..
