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A report to have responded slowly was reinforced after a
fixed-ratio schedule, whereas a report to have responded rapidly
was reinforced after a differential-reinforcement-of-Iow-rate
schedule. All 5 undergraduates reported they had responded
slowly when the last interresponse time during the preceding
schedule had been short, and had responded rapidly when the
last interresponse time had been long. This referent-report relation
was not observed when every report was reinforced
nondifferentially. The results demonstrate that the self-reports
were affected by the differential reinforcement when schedule
performances were their referent.