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Motivated responding (mean ± SEM) on variable ratio 120-s schedules of reinforcement for children who did (n = 38) and did not (n = 46) sensitize with the definition of an increase in responding of ≥10% for minutes 3 and 4 compared with minutes 1 and 2. There was a significant difference in the rate of habituation between those who did and did not sensitize (P < 0.001).
