Evolution is a wandering process wherein multiple simultaneous influences, including chance and circumstance, shape biological structures over eons. … - Thomas Lewis

Because other mammals have expressions, does that mean they have feelings — a subjective experience of the emotional states they display? That idea was scientifically risible not so long ago. Now some emotion scientists endorse the proposition that other mammals possess emotional consciousness — that they feel. This reversal delights animal advocates eager to make an argument for panprotoplasmic parity. But when the zoophile Mark Derr writes, “The question of whether animals possess consciousness, intelligence, volition, and feelings has long been settled in the affirmative,” he must be reporting the consensus from a species other than our own. Animals may have decided the matter to their own satisfaction, but human beings, as far as we know, are still debating it.

A number of scientists now believe that somatic concordances like these are not just normal but necessary for mammals. The mammalian nervous system depends for its neurophysiologic stability on a system of interactive coordination, wherein steadiness comes from synchronization with nearby attachment figures.

People who need regulation often leave therapy sessions feeling calmer, stronger, safer, more able to handle the world. Often they don't know why. Nothing obviously helpful happened - telling a stranger about your pain sounds nothing like a certain recipe for relief. And the feeling inevitably dwindles, sometimes within minutes, taking the warmth and security with it. But the longer a patient depends, the more his stability swells, expanding infinitesimally with ever session as length is added to a woven cloth with each pass of the shuttle, each contraction of the loom. And after he weaves enough of it, the day comes when the patient will unfurl his independence like a pair of spread wings. Free at last, he catches a wind and rides into other lands. (172)