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TL;DR: He was very good at reading human emotions and noticed when people got excited as he approached the correct answer, then stopped.
This is always the explanation… There is a term for it, and I cannot recall at this moment. It is related to the Clever Hans Effect (https://en.wikipedia.org/wiki/Clever_Hans), but there’s another term for it… “Facilitated…” something?
Edit: I think it’s “facilitated communication” https://en.wikipedia.org/wiki/Facilitated_communication
Don’t be a neigh-sayer
