A person's thought process is very closely tied with their physiology.

A dog senses your fear:
how did he know if you didn't tell him?

If a friend is depressed, most of us can tell without even talking with them.

We pick up clues from their body: slumped shoulders, eyes downcast, head down,
lack of animation (and in extreme cases, a loaded pistol held to the head).

Sensory acuity takes these observations beyond the more obviously recognizable
clues and uses the physical feedback in addition to someone's words to gain as
much from communication as possible.

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