Eye Movements during Visuomotor Adaptation Represent Only Part of the Explicit Learning

Area of Science:

• Neuroscience
• Cognitive Psychology
• Motor Control

Background:

• Visuomotor rotations are learned via explicit strategies and implicit recalibration.
• Quantifying the distinct contributions of these learning components is challenging.
• Eye movements are hypothesized to reflect explicit strategy use.

Purpose of the Study:

• To compare eye movements with established measures of explicit learning (verbal report, exclusion test).
• To investigate whether eye movements capture all explicit adaptation components.

Main Methods:

• Adaptation to visuomotor rotations.
• Recording eye movements during adaptation.
• Utilizing verbal reports and the exclusion test to measure explicit learning.
• Analyzing reaction times.

Main Results:

• When participants reported strategies, eye movements aligned with verbal reports and exclusion tests.
• Without explicit reporting, some participants' eye movements indicated less explicit adaptation than exclusion tests.
• Participants showed distinct patterns: fully implicit, fully explicit, or mixed adaptation.
• Eye movements reflected only a subset of explicit learning components, particularly those with longer reaction times.

Conclusions:

• Explicit learning in visuomotor adaptation comprises multiple components.
• Eye movements capture some, but not all, explicit learning strategies.
• Individual differences exist in how explicit strategies are employed and reflected in eye movements.