Further support that surprise and not novelty supports sensory reinforcement comes from the evidence that light offsets are more-or-less as good reinforcers as light onsets (Glow, 1970; Russell and Glow, 1974). But in the case of light offset, where is the “novel” stimulus that acts as a reinforcer (by supposedly triggering dopamine)? In this case it is even more clear that it is the unexpectedness of the event (surprise), not the novelty of the stimulus (which is absent), that is at play.
Glow P. (1970). Some acquisition and performance characteristics of response contingent sensory reinforcement in the rat. Aust. J. Psychol. 22, 145–154 10.1080/00049537008254568
Russell A., Glow P. (1974). Some effects of short-term immediate prior exposure to light change on responding for light change. Learn. Behav. 2, 262–266 10.3758/BF03199191