Extinction of an appetitive operant response after administration of MSH

Abba J. Kastin, George L. Dempsey, Beverly LeBlanc, Kjell Dyster-Aas, Andrew V. Schally

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Hungry rats were trained to press a lever in order to obtain food on a fixed ratio (FR) or variable ratio (VR) of reinforcement. Rats trained on the FR schedule and injected with synthetic α-MSH had delayed extinction of the task as compared with control rats injected with diluent. The results show that MSH affects the behavior of rats in another type of behavioral situation involving an appetitive operant response.

Original languageEnglish (US)
Pages (from-to)135-139
Number of pages5
JournalHormones and Behavior
Issue number2
StatePublished - Jun 1974
Externally publishedYes

ASJC Scopus subject areas

  • Endocrinology
  • Endocrine and Autonomic Systems
  • Behavioral Neuroscience


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