Differential effects of methylphenidate on signalled and non-signalled reinforcement

M. W. Emmett-Oglesby, K. E. Taylor, R. E. Dafter

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Rats were trained to press a bar with water reinforcement under a variable interval 15-sec (VI 15), variable interval 15-sec signalled-reinforcement (VI SD), or a differential-reinforcement-of-low-rate 10-sec (DRL 10) schedule. Methylphenidate (MP) had little effect on response rates or reinforcements-earned in the VI 15 group. However, MP increased response rates in a dose-related manner in the VI SD and the DRL 10 groups. These findings and additional results reported in the literature suggest that signalled reinforcement does not necessarily antagonize the rate-increasing effects of the amphetamine-type drugs.

Original languageEnglish
Pages (from-to)467-470
Number of pages4
JournalPharmacology Biochemistry and Behavior
Issue number3
StatePublished - 1980


  • Extinction
  • Methylphenidate
  • Signalled reinforcement
  • Stimulus control


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