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Irrelevant Stimuli and Action Control: Analyzing the Influence of Ignored Stimuli via the Distractor-Response Binding Paradigm

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Divided stimulus control: a replication and a quantitative model.

Michael Davison¹, Douglas Elliffe

¹Department of Psychology, The University of Auckland, New Zealand. m.davison@auckland.ac.nz

Journal of the Experimental Analysis of Behavior

|February 1, 2011

Summary

This summary is machine-generated.

This study shows that pigeons learn to distinguish stimuli better when they are rewarded more often for doing so. Reinforcer frequency directly impacts how well animals can discriminate between different environmental cues.

Keywords:

compound stimuli conditional discrimination key peck pigeons relative reinforcers stimulus control

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Area of Science:

Behavioral psychology
Animal cognition

Background:

Conditional discrimination is a key learning process.
Stimulus control is influenced by reinforcement history.

Purpose of the Study:

To investigate how relative reinforcer frequency affects stimulus discriminability in pigeons.
To test the predictive power of Davison and Nevin's (1999) model.

Main Methods:

Pigeons were trained on conditional discriminations using compound stimuli.
Reinforcer probabilities for different stimulus dimensions were systematically varied.
Discriminability was quantified using log d's.

Main Results:

Discriminability increased with higher relative reinforcer frequency for a given dimension.
Discriminability was not affected by the variability of stimuli in the other dimension.
Redundant-cue conditions did not alter maximal discriminability.

Conclusions:

Relative reinforcer frequency is a critical determinant of stimulus discriminability.
Davison and Nevin's model accurately predicts these effects on divided stimulus control.