A differential outcomes effect using biologically neutral outcomes in delayed matching-to-sample with pigeons

Area of Science:

• Behavioral psychology
• Animal cognition
• Comparative psychology

Background:

• The differential outcomes effect (DOE) is a phenomenon where conditional discrimination learning is enhanced.
• This effect occurs when each correct stimulus-choice sequence is consistently followed by a unique outcome.
• Previous research has demonstrated the DOE with biologically relevant outcomes like food or water.

Purpose of the Study:

• To investigate the differential outcomes effect (DOE) in pigeons.
• To determine if the DOE can be demonstrated using biologically neutral outcomes.
• To extend previous findings on the DOE with non-aversive, neutral stimuli.

Main Methods:

• Pigeons were trained on conditional discrimination tasks.
• Experiment 1 involved a light as one outcome and its absence as the other, replicating rat studies.
• Experiment 2 used two distinct, biologically neutral outcomes with similar properties.

Main Results:

• Evidence for the differential outcomes effect (DOE) was found in pigeons.
• The DOE was observed even when using a light as a biologically neutral outcome.
• The effect persisted when two similar, neutral outcomes were employed, suggesting broader applicability.

Conclusions:

• The differential outcomes effect (DOE) can be demonstrated in pigeons using biologically neutral outcomes.
• The nature of the outcome (biological relevance) may not be essential for the DOE.
• These findings contribute to understanding the mechanisms of associative learning and outcome-specific effects.