Steve, one of the contributions that you've met is to ground loosely associated ideas in psychology and in clinical practice in evolutionary neurobiology. So we are conveying our physiological state in our voice, expressing it in our face and our nervous system because those nerves and muscles in the face and head create a social engagement system. And even when we listen, when we listen to prosodic voices, our nervous system calms down. It's a trigger to the nervous system. Those are cues of safety, which are vagal nerve stimulators.

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