Subconscious defences in the body

I notice there is something that an actor does subconsciously that effectively cuts off the flow of the "unedited" truths from surfacing from his nether regions to his voice - at the neck (this is an observation which seems to be true but could use further bolstering from the sciences). By ever so discretely bending the neck and slouching, call it the "flow of energy" , what you will, the lower body becomes lazy and disconnected - like a cop out from life - a conscious/subconscious choice to disconnect from the parts of ourselves we are not ready to confront. our fears.