I would argue that the verb forms of calm and sooth connote stimulation, whereas the adjective form of calm might be a lack of stimuli. I'm not sure there is a present tense adjective form of sooth? But certainly one might say, "this music is very calming" so in that case the stimulus is causing the non-stimulated (by my definition) state... Offsetting the anxiety causing stimuli? I am neither a linguist nor a medical professional, but you got me thinking! Thanks.

Someone smarter than me please let me know :D