Task specificity in nonspecific transfer and in extradimensional stimulus generalization in pigeons

Area of Science:

• Cognitive Psychology
• Animal Behavior
• Learning and Memory

Background:

• General attention theory posits that true discrimination (TD) training enhances attentiveness, leading to broader transfer effects compared to pseudodiscrimination (PD) training.
• Previous studies primarily used go-no-go (GN) discrimination, leaving the role of discrimination training itself unclear.

Purpose of the Study:

• To investigate if discrimination training per se, independent of specific training paradigms, induces general attentiveness and nonspecific transfer.
• To differentiate between attention-based transfer and task-specific learning in pigeons.

Main Methods:

• Pigeons underwent TD or PD training using successive-conditional (SC) or go-no-go (GN) discriminations.
• Transfer tests involved new discriminations (SC or GN) with different stimuli (line orientations to colors).
• Experiment 3 used single-stimulus (SS) training followed by generalization tests to assess stimulus generalization gradients.

Main Results:

• Transfer was facilitated only when the original and transfer discrimination types matched (SC-SC or GN-GN).
• Results were consistent across different procedural variations, including those mimicking prior 'general attention' experiments.
• Only TD-GN training produced sharp stimulus generalization gradients, linking this training type to generalization, not attention.

Conclusions:

• Positive nonspecific transfer appears mediated by task-specific learning, not general attentiveness.
• Go-no-go discrimination training and stimulus generalization are closely linked by task requirements, not attentional mechanisms.
• Task-appropriate response tendencies likely explain the observed effects in discrimination learning and transfer.