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Recording Single Neurons' Action Potentials from Freely Moving Pigeons Across Three Stages of Learning

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Published on: June 2, 2014

Ephemeral reward task: Why is it so difficult for pigeons to learn it?

Daniel Peng¹, Zohaib Iqbal¹, Thomas R Zentall¹

¹Department of Psychology, University of Kentucky.

Journal of Experimental Psychology. Animal Learning and Cognition

|June 30, 2025

Summary

Pigeons struggled with the Ephemeral Reward Task until reward probabilities were reduced. Lowering reward probability to 50% enabled pigeons to learn optimal choice strategies.

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Area of Science:

Animal Cognition
Behavioral Neuroscience
Comparative Psychology

Background:

The Ephemeral Reward Task involves choosing between stimuli A and B for rewards.
Wrasse, parrots, and primates learn this task, but pigeons and rats do not.
Previous research suggests pigeons' difficulty may stem from stimulus-outcome similarity.

Purpose of the Study:

To investigate why pigeons fail to learn the Ephemeral Reward Task.
To test the hypothesis that stimulus-outcome similarity hinders learning.
To explore the role of reward magnitude and probability in pigeon learning.

Main Methods:

Experiment 1: Modified stimuli (C) after choice B to test outcome similarity hypotheses (groups AC, BC, BB).
Experiment 2: Reduced reward probability for choices A and B to 50% for pigeons.
Behavioral observation and analysis of choice patterns to assess learning.

Main Results:

Pigeons in Experiment 1 failed to learn optimal strategies across all modified conditions (AC, BC, BB).
Pigeons in Experiment 2 successfully learned to choose optimally when reward probability was 50%.
The difference in perceived value between one and two rewards might be less impactful than the difference between 0.5 and one reward.

Conclusions:

Stimulus-outcome similarity does not appear to be the primary reason for pigeons' difficulty in the standard Ephemeral Reward Task.
Reward probability significantly influences pigeons' ability to learn optimal strategies in this task.
The relative value of rewards, particularly the difference between fractional and certain rewards, is a critical factor in learning.