Interesting tidbit. I saw a research paper go by that reported that people who have gotten recent cosmetic botox treatments relate to their fellow humans in a less empathetic manner that those who have not.
The interpretation was this: Much of human communication is non-verbal. And generally, that non-verbal communication is not conscious. Our body language and facial expressions happen without our thinking about it, as immediate social response to input.
The weird thing is that your own brain then also uses the fact that you've made an expression as an input. Our somatic nerves, in our face and body, feed back into our cognitive processes. The fact that you have smiled, frowned, scowled, or the like can shape how you think!
And, if you for some reason cannot make facial expressions, like, because Botox has paralyzed some of your facial nerves for a while, you don't get that feedback to form your thinking - if you can't communicate an emotion on your face, that emotion will impact your thinking less.