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Experiment 1: Discrimination ratio [pecks to S10/(pecks to S10 + pecks to S0)] as a function of training. Dashed line indicates the point in training at which the schedule of reinforcement associated with S10 and S3 changed from fixed time (response independent) to fixed interval (response dependent). Error bars indicate ± one standard error. The figure ends at 45 sessions because all of the pigeons received at least this much training- the average from all 8 pigeons is presented.
