Midsession reversals with pigeons: visual versus spatial discriminations and the intertrial interval

Area of Science:

• Animal behavior
• Cognitive psychology
• Comparative cognition

Background:

• Discrimination reversal learning assesses behavioral flexibility in response to changing reinforcement.
• Pigeons exhibit anticipatory and perseverative errors in simultaneous-discrimination, midsession-reversal tasks.
• These errors suggest reliance on temporal cues over feedback during reversals.

Purpose of the Study:

• To investigate factors influencing pigeons' suboptimal performance in reversal learning.
• To determine if the discrimination type (spatial vs. visual) or intertrial interval duration affects reversal learning efficiency.
• To identify conditions promoting optimal discrimination reversal learning in pigeons.

Main Methods:

• Pigeons were trained on a simultaneous-discrimination, midsession-reversal task.
• The nature of the discrimination was manipulated (spatial vs. visual).
• The intertrial interval duration was varied (5.0 s vs. 1.5 s).

Main Results:

• Pigeons made anticipatory and perseverative errors, suggesting reliance on temporal cues.
• Optimal reversal learning was observed only under specific conditions.
• Efficient reversal learning occurred when the discrimination was spatial and the intertrial interval was short (1.5 s).

Conclusions:

• Pigeon's reversal learning is influenced by both the discrimination's nature and temporal factors.
• Short intertrial intervals and spatial discriminations facilitate more adaptive behavioral flexibility.
• These findings offer insights into the mechanisms of decision-making and learning in avian models.