Brain processing of visual information during fast eye movements maintains motor performance

Area of Science:

• Neuroscience
• Motor Control
• Ophthalmology

Background:

• Movement accuracy relies on error detection during action execution.
• Saccadic eye movements are rapid, and visual perception is limited during them (saccadic suppression).
• Existing models propose saccadic adaptation depends on post-movement visual error signals.

Purpose of the Study:

• To investigate if saccadic adaptation can be driven by visual information available *during* saccade execution.
• To determine the critical visual phase (acceleration vs. deceleration) for intra-saccadic adaptation.
• To challenge and refine current models of saccadic adaptation.

Main Methods:

• Introducing visual error signals by shifting and blanking a target during saccade execution.
• Comparing adaptation levels from intra-saccadic errors versus post-saccadic errors.
• Analyzing the role of different saccade phases (acceleration, deceleration) in adaptation.

Main Results:

• Intra-saccadic visual error signals induce adaptation comparable to post-saccadic signals.
• Saccadic adaptation relies on visual information during the deceleration phase of the saccade.
• The acceleration phase of the saccade is not critical for this type of adaptation.

Conclusions:

• The human brain can utilize brief visual information during saccades for motor adaptation.
• This finding necessitates a re-evaluation of current models of saccadic adaptation.
• Fast eye movement adaptation is more flexible than previously assumed.