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Cooperative responding in rats maintained by fixed- and variable-ratio schedules.

Lucas Couto de Carvalho1,2, Letícia Dos Santos2,3, Alceu Regaço2,3

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Summary

Reinforcement schedules significantly influence cooperative behavior in rats. Intermittent schedules, like fixed-ratio and variable-ratio, yield higher cooperative response rates than continuous reinforcement, shaping distinct behavioral patterns.

Keywords:
cooperationfixed-ratioratsschedules of reinforcementvariable-ratiowater

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Area of Science:

  • Behavioral Psychology
  • Animal Behavior
  • Operant Conditioning

Background:

  • Reinforcement schedules are fundamental in shaping behavior.
  • Understanding cooperative responding is crucial for social behavior research.
  • Previous research has explored reinforcement schedules' effects on individual behavior.

Purpose of the Study:

  • To investigate the impact of fixed-ratio (FR) and variable-ratio (VR) reinforcement schedules on cooperative responding in pairs of rats.
  • To analyze the specific patterns of cooperative behavior generated by different reinforcement schedules.

Main Methods:

  • Pairs of rats were trained under FR and VR schedules where water delivery depended on joint responding.
  • Experiment 1 compared FR 1, FR 10, and VR 10 schedules.
  • Experiment 2 parametrically manipulated ratio sizes for FR and VR schedules.
  • Experiment 3 contrasted an FR6 schedule with a yoked control.

Main Results:

  • Cooperative response rates and proportions were higher under intermittent (FR and VR) schedules compared to continuous reinforcement.
  • FR 10 schedules produced a 'break-and-run' pattern, while VR 10 schedules resulted in high, constant response rates.
  • Cooperative responding generally increased with ratio sizes from 1 to 5 but showed no consistent trend thereafter.
  • Coordinated behavior occurred at a higher rate under the FR6 schedule than the yoked control.

Conclusions:

  • External consequences and the specific reinforcement schedules governing their delivery effectively select and shape patterns of coordinated behavior.
  • Different reinforcement schedules produce distinct, predictable patterns of cooperative responding.
  • The findings highlight the role of operant conditioning principles in the emergence of social behavior.