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Keywords:

  • preference;
  • reinforcer assessment;
  • restriction;
  • differential reinforcement;
  • lag schedules;
  • conditioned reinforcement;
  • variability

The present study evaluated the effects of a lag differential reinforcement contingency on 2 students' activity selections using reversal designs. Results showed that the lag contingency was responsible for promoting increased novel selections, engagement in diverse activities, and greater progress with respect to programmed academic activities.