Naloxone's effects on operant responding depend upon level of deprivation

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

Naloxone's effects on initiation, maintenance, and maximal response effort to acquire food were examined in rats maintained under different levels of food deprivation. In Experiment 1, naloxone was administered SC to rats responding under an FR 80 (first pellet) FR 3 (subsequent pellets) reinforcement schedule. Naloxone did not increase time to acquire the first pellet. Naloxone's suppression of subsequent intake and lowest effective dose were inversely related to level of deprivation. In Experiment 2, rats responded for food under a Progressive Ratio 2 reinforcement schedule. Breakpoint was lowered only when rats were maintained with free access to food. Decreases in response and running rate were inversely related to deprivation level. Results are consistent with the hypothesis that opioids are involved in the maintenance but not the initiation of feeding.

Original languageEnglish (US)
Pages (from-to)377-383
Number of pages7
JournalPharmacology, Biochemistry and Behavior
Volume49
Issue number2
DOIs
StatePublished - Oct 1994

Keywords

  • Feeding
  • Naloxone
  • Operant reinforcement
  • Opiates

Fingerprint Dive into the research topics of 'Naloxone's effects on operant responding depend upon level of deprivation'. Together they form a unique fingerprint.

Cite this