Humans have special nerves that respond to gentle stroking.

Sometimes there’s nothing more comforting than loved one’s caress. And, in fact, our bodies are built to respond to touch: we have special nerves in our skin (C-tactile afferents, or “CT”) that fire when we are gently stroked. In this study, the authors wanted to test how specific these CT nerves are. To do so, they measured how the nerves responded to strokes from robot hands at different temperatures and speeds. It turns out that CTs respond best to slow caresses, and, just like Goldilocks

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