Benefits associated with the standing position during visual search tasks.

Area of Science:

• Human motor control
• Visual perception
• Cognitive neuroscience

Background:

• Limited attentional resources suggest dual-task performance is worse than single-task performance.
• Previous research indicates postural control is essential for visual task execution.

Purpose of the Study:

• To investigate the relationship between postural control and visual task performance while standing versus sitting.
• To determine if postural control is modulated by visual task difficulty (search vs. control).

Main Methods:

• Young adults performed visual search, free-viewing, and fixation tasks while standing or sitting.
• Measurements included task performance, eye, head, and body sway (center of pressure displacements).

Main Results:

• Visual search task performance was equivalent when standing or sitting.
• Postural sway was reduced during visual search when standing, indicating adapted postural control.
• Head rotation, rather than eye movement, was used for visual exploration, particularly during search.

Conclusions:

• Postural control variability is beneficial, not detrimental, for visual task performance, especially during challenging search tasks.
• Standing facilitates adaptive postural control for visual tasks, while sitting may require compensatory movements.