thinks aloud

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on Page 261:

"... and his fellow behaviorists had banished from experimental psychology, as Simon and Newell recognized : "Evidence from a subject who thinks aloud is sometimes compared with evidence obtained by asking the subject to theorize introspectively about his own thought processes. This is misleading. Thinking aloud is just as truly behavior as is circling the correct answer on a paper-and-pencil test. What we infer from it about other process going on inside the subject(or the machine) is, of course, another question... ..."

thinks aloud
Speak one's thoughts audibly, as in We need flour, sugar, butter--I'm just thinking aloud. [Early 1700s]