Eye Tracking Insights Into Movement Preparation and Execution Under Nonstandard Visual Movement Feedback

Area of Science:

• Cognitive Neuroscience
• Motor Control
• Oculomotor Research

Background:

• Accurate eye-hand coordination relies on predicting sensory consequences of movements.
• These predictions may be adjusted during the preparatory phase of action.

Purpose of the Study:

• To investigate the oculomotor correlates of planning and executing coordinated eye-hand movements.
• To examine how standard versus nonstandard visual hand movement feedback influences these processes.
• To understand the role of pre-movement expectations in eye-hand coordination.

Main Methods:

• Employed a delayed-movement paradigm combined with virtual reality-based eye-hand tracking.
• Measured pupil dilation and gaze-hand tracking during action preparation and execution.
• Manipulated visual feedback to be congruent or incongruent with cued expectations.

Main Results:

• Pupil diameter increased during preparation when movements were pre-cued and nonstandard feedback was expected.
• Gaze-hand tracking performance decreased under nonstandard feedback, especially when movements were not pre-cued.
• Expectation violations, particularly of congruent visuomotor mappings, caused stronger pupil dilation and impaired tracking.

Conclusions:

• Oculomotor responses reflect motor planning and prediction of sensory consequences.
• Pupillary responses indicate mental effort and expectation of sensory conflict.
• Specific expectations about visuomotor congruency impact eye-hand coordination and pupillary responses.