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Visuomotor predictors of interception.

Inmaculada Márquez1,2, Mario Treviño3

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Understanding how we intercept moving targets involves eye movements, pupil size, and hand control. This study reveals how visual and motion uncertainty affects these factors, crucial for sports and gaming.

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Area of Science:

  • Visuomotor control
  • Human motor behavior
  • Cognitive neuroscience

Background:

  • Intercepting moving targets is vital in sports, gaming, and daily activities.
  • Precise visual processing and motor control are essential for effective interception.
  • Gaps exist in understanding the interplay of eye movements, pupil size, and hand control during interception tasks.

Purpose of the Study:

  • To explore the dynamic interplay among eye movements, pupil size, and interceptive hand movements.
  • To investigate the influence of visual and motion uncertainty on interception strategies.
  • To distinguish between simple tracking and predictive interception trajectories.

Main Methods:

  • Developed a visuomotor task using a joystick to control a computer-generated dot on 2D trajectories.
  • Manipulated target speed and directional uncertainty during chase trials.
  • Conducted geometric analysis of optimal interception angles and analyzed eye-tracking and pupillary data.

Main Results:

  • Participants adopted a strong interception strategy as they approached the target.
  • The optimal interception strategy was influenced by target speed and directional changes.
  • Eye-tracking data showed continuous gaze adjustments, and pupillary responses predicted interception strategy success.

Conclusions:

  • Visuomotor parameters, including eye movements and pupil size, are crucial for complex interception tasks.
  • Task parameters like target speed and uncertainty significantly modulate interception strategies.
  • Pupillary responses offer insights into the cognitive processes underlying successful interception.