In the Serenity example, I don't think it was exposure to the Pax that restored River's sanity (because I don't think there was still any in the atmosphere by that point), but knowing the truth, so being able to reconcile the mind-breaking contradictions she'd been exposed to, that did it.
In the Serenity example, I don't think it was exposure to the Pax that restored River's sanity (because I don't think there was still any in the atmosphere by that point), but knowing the truth, so being able to reconcile the mind-breaking contradictions she'd been exposed to, that did it.