“Um”ing and “Uh”ing (when dosed with Ketamine)

Many people spontaneously use the word (or sound) “Um” in conversation, a phenomenon which has prompted a considerable volume of academic attention (some of which we discussed recently). A question arises though, can someone be induced to say “Um” by chemical means – say with the use of a powerful anaesthetic? Like, for example Ketamine? [Note: […]