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In a First, a Prosthetic Limb Can Sense Temperature Like a Living Hand
(www.smithsonianmag.com)
This is a most excellent place for technology news and articles.
It sounds like instead of a different stimulus to differentiate between hot and cold (like what I think you describe) the limb in the article is able to stimulate nerves that feel “hot” vs “cold”
Either way that’s super cool you saw that back then, always awesome to see how stuff moves along over the years.