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Related Experiment Video

Updated: Jun 21, 2026

New Variations for Strategy Set-shifting in the Rat

New Variations for Strategy Set-shifting in the Rat

Published on: January 23, 2017

Sensitivity, changeover responses, and choice in transition.

Angel A Jiménez¹, Carlos F Aparicio

¹Universidad de Guadalajara, Centro Universitario de Arte, Arquitectura y Diseño (CUAAD), CUCS, Mexico. angel.jimenez@cuaad.udg.mx

Behavioural Processes

|July 21, 2009

Summary

Behavioral choice rapidly adapts to changing reinforcer availability. Higher fixed-ratio changeover (FR CO) requirements increase sensitivity to reinforcement, reaching asymptote faster with larger FR COs.

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Area of Science:

Behavioral psychology
Animal behavior
Decision-making

Background:

Studies show reinforcement sensitivity increases with fixed-ratio changeover (FR CO) requirements in steady-state choice.
The generality of this finding in transitional choice scenarios requires further investigation.

Purpose of the Study:

To assess the impact of rapid changes in reinforcer ratios on choice behavior.
To determine if increased fixed-ratio changeover (FR CO) requirements enhance sensitivity to reinforcement during choice transitions.

Main Methods:

Concurrent variable-interval (VI) schedules presented seven different reinforcer ratios (e.g., 27:1 to 1:27) in random order within sessions.
Fixed-ratio changeover (FR CO) requirements ranged from 1 to 64 responses to switch between levers.
Behavioral choice adjustments and reinforcement sensitivity were measured across varying FR CO requirements.

Main Results:

Choice behavior rapidly adjusted to changes in reinforcer ratios, consistently tracking the lever with the higher probability of reinforcement.
Sensitivity to reinforcement increased with higher FR CO requirements, mirroring previous steady-state findings.
Sensitivity reached asymptote values more quickly with larger FR CO requirements (8, 16, 32 responses) compared to smaller ones (1, 2, 4 responses).

Conclusions:

Behavioral choice demonstrates rapid adaptation to dynamic changes in reinforcement schedules.
Increasing fixed-ratio changeover (FR CO) requirements enhance sensitivity to reinforcement, particularly during transitional choice periods.
The rate of sensitivity asymptote achievement is influenced by the magnitude of FR CO requirements.