A patient reports hearing a voice that narrates what he is doing throughout the day — "he is getting up, he is walking to the kitchen" — but the voice never repeats anything he has actually thought. Before revealing the answer: is this thought echo?

No, this is more consistent with a running-commentary voice than with thought echo. Thought echo specifically involves a voice repeating or speaking the patient's own thoughts word for word; here, the voice instead narrates his ongoing actions in the third person, which is the defining feature of a running commentary rather than an echo of his thinking. The two are both auditory hallucinations that can occur in the same patient, but the content — actions narrated versus thoughts repeated — is what distinguishes them.