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Self-imposed time-out by rats.

Fernanda Bordignon Luiza1, Guilherme Lauro Hoffmanna1, Maria Helena Leite Hunzikera1

  • 1Universidade de São Paulo, Cidade Universitária, Av. Prof. Mello Moraes, 1721, São Paulo, SP 05508-030, Brazil.

Behavioural Processes
|May 7, 2026
PubMed
Summary

Self-imposed time-out (TO) is a behavior where rats escape aversive reinforcement schedules. This escape behavior, not stimulus change, is reinforced, challenging traditional learning theories.

Keywords:
Aversive controlFixed-ratio schedulePositive reinforcementSelf-imposed TO

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Area of Science:

  • Behavioral Psychology
  • Animal Behavior
  • Operant Conditioning

Background:

  • Self-imposed time-out (TO) is a response that temporarily suspends reinforcement and alters stimuli.
  • Competing hypotheses suggest TO is either escape from reinforcement or positively reinforced by stimulus changes.

Purpose of the Study:

  • To test whether time-out functions as escape from reinforcement or is positively reinforced by stimulus changes.
  • To investigate the reinforcing properties of stimulus changes during time-out.

Main Methods:

  • Sixteen male Wistar rats were exposed to a two-lever chamber.
  • Lever 1 delivered water under escalating fixed-ratio (FR) schedules.
  • Lever 2 produced time-out (suspending reinforcement and altering lighting), altered lighting only, or no consequence.

Main Results:

  • Rats in the time-out group pressed Lever 2 most frequently, with rates increasing alongside FR values.
  • Time-out responses peaked post-reinforcement, and lever pressing ceased during time-out.
  • Reinforcement rates were similar across groups, while rats in other groups showed minimal Lever 2 use.

Conclusions:

  • Findings strongly support the escape hypothesis, indicating time-out is maintained by negative reinforcement from aversive aspects of FR schedules.
  • Results challenge dichotomies between aversive and appetitive control.
  • Positive reinforcement contingencies can acquire aversive properties driving escape behavior.