Optimization of postural control in precise gaze shifts and laser pointing

Area of Science:

• Human motor control
• Visual perception
• Biomechanics

Background:

• Young adults typically reduce postural sway for precise tasks like visual search and laser pointing.
• Previous research often focuses on single tasks, not the simultaneous execution of visual exploration and pointing.

Purpose of the Study:

• To investigate if young adults can further reduce postural sway and center of pressure sway when performing visual search and laser pointing tasks concurrently.
• To examine the interplay between postural control and dual-task performance in a novel experimental setup.

Main Methods:

• Twenty-five healthy young adults performed six visual tasks, including free-viewing, visual search (easy and hard), and laser pointing (with laser on/off).
• Postural sway and center of pressure sway were measured during these tasks.
• A novel methodology allowed simultaneous visual exploration and pointing, differing from traditional pointing tasks.

Main Results:

• Postural sway and center of pressure sway were reduced complementarily to support both visual search and pointing.
• The laser pointing task exerted a stronger influence on postural sway than the visual search tasks.
• Participants employed a functional strategy, stabilizing posture for pointing and image exploration.

Conclusions:

• It is possible to modulate experimental methodology to prioritize postural control for pointing tasks over visual search tasks, reversing typical findings.
• During search tasks, participants primarily used eye and head movements for stabilization, minimizing whole-body movement.
• Findings have potential applications in fields like shooting sports, gaming, and rehabilitation.