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A representative example of the average pattern of responding from a single rat observed during an electrophysiological recording session (A). FI nosepoke responses formed a near-symmetrical peak distribution, centered near 15 s, while two separate periods of responding occurred on the VI nosepoke. (B) Depicts the pattern of responding observed in an individual probe trial. Black lines indicate occupancy in the VI nosepoke, and grey lines indicate occupancy in the FI nosepoke.
