Researchers have given the link between botox and emotions the rather grand title "The Facial Feedback Hypothesis" which states that facial movement can influence emotional experience. Of course those of us familiar with AT will immediately recognise this as Psychphysical Unity. We know that it is a mechanism that isn't just restricted to facial muscle feedback. I have written about psychophysical unity in a previous post.
Study: Botox Erases Wrinkles, Maybe Emotions Too
Not surprisingly, the multi-million pound botox industry has defended itself by casting doubt on the validity of the study and publishing interviews with famous "frozen visages" stating how happy they feel with their new "youthful" appearance. Not that "happy" was the emotion that the study focussed-on. They have even countered by suggesting that the facial feedback effect could be used to control depression! They don't specify exactly which muscles are responsible for expressing depression or whether those muscles are also involved in all the other emotional expressions.
Given the risks associated with the toxin itself, my view is that whether or not this study is repeated and validated, the risk of impairing your emotional responses is too high a price to pay for vanity.