Appetitive operant behavior and free-feeding in rats exposed to acute stress

Bradley D. Youngblood, Donna H. Ryan, Ruth Babette Harris

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This study investigated whether appetitive operant food reinforcement or free-feeding behavior in rats, food-restricted to 85% of body weight, was disrupted by exposures to 3 h of restraint stress or by 3 h of restraint plus water immersion stress (RWI). Rats were trained under a 3-cycle 10-min time-out-10-min time-in fixed-ratio 15 (FR15) schedule of food reinforcement. Free-feeding was measured in a 3-cycle 10-min food jar-out-l0-min food jar-in test conducted in the operant chambers. Three hours of restraint stress did not significantly affect response rate or food reinforcement in the operant FR15 task or in the free-feeding condition. In contrast, 3 h of RWI completely abolished operant food reinforcement and suppressed response rate, whereas free-feeding was significantly reduced but not abolished in food-restricted, hungry rats. We conclude that acute restraint stress in food-restricted, hungry rats does not affect their appetite or motor ability to lever-press for food nor did it affect their ability to feed in a free-feeding situation. In contrast, RWI stress may have induced a motor impairment, or some other aspect of motivation independent of hunger, that disrupted their performance in the operant FR15 task.

Original languageEnglish (US)
Pages (from-to)827-830
Number of pages4
JournalPhysiology and Behavior
Volume62
Issue number4
DOIs
StatePublished - Jan 1 1997
Externally publishedYes

Fingerprint

Appetitive Behavior
Food
Aptitude
Reinforcement Schedule
Hunger
Feeding Behavior
Appetite
Immersion
Dehydration
Motivation

Keywords

  • Food intake
  • Food restriction
  • Free-feeding
  • Operant behavior
  • Rats
  • Restraint
  • Stress

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Behavioral Neuroscience

Cite this

Appetitive operant behavior and free-feeding in rats exposed to acute stress. / Youngblood, Bradley D.; Ryan, Donna H.; Harris, Ruth Babette.

In: Physiology and Behavior, Vol. 62, No. 4, 01.01.1997, p. 827-830.

Research output: Contribution to journalArticle

Youngblood, Bradley D. ; Ryan, Donna H. ; Harris, Ruth Babette. / Appetitive operant behavior and free-feeding in rats exposed to acute stress. In: Physiology and Behavior. 1997 ; Vol. 62, No. 4. pp. 827-830.
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