The order of stimuli matters when learning second-order transitional probabilities.

Area of Science:

• Cognitive psychology
• Neuroscience
• Computational modeling

Background:

• Sequence processing relies on understanding stimulus order and transitional probabilities (TPs).
• Second-order TPs, where two stimuli predict a third, are crucial but less understood.
• General learning mechanisms' ability to extract complex sequential information requires further investigation.

Purpose of the Study:

• To investigate statistical learning of second-order transitional probabilities (TPs).
• To determine if the order of stimulus presentation within pairs affects learning.
• To identify challenges in learning second-order TPs and their interaction with stimulus order.

Main Methods:

• Utilized eight visuomotor sequences governed by second-order TPs.
• Recorded response times (RTs) during learning and switch phases with reversed TPs.
• Conducted two experiments to isolate learning of order versus learning of TPs.

Main Results:

• RTs decreased during learning and increased during TP reversal, suggesting some learning of order variations.
• Most participants found learning second-order TPs difficult.
• Difficulty stemmed from learning TPs alongside stimulus order, not just order effects.

Conclusions:

• Statistical learning can acquire complex associations, demonstrating cognitive flexibility.
• Learning second-order transitional probabilities presents a significant challenge for human cognition.
• Future research should explore factors influencing the learning of complex sequential information.