Effects of spatial and nonspatial cognitive activity on postural stability

Area of Science:

• Neuroscience
• Human Movement Science
• Cognitive Psychology

Background:

• Postural stability is crucial for daily activities.
• The interplay between cognitive demands and postural control is not fully understood.
• Age-related changes may exacerbate cognitive-motor interference.

Purpose of the Study:

• To investigate whether postural stability is automatically controlled or influenced by cognitive activity.
• To examine how different cognitive tasks (spatial vs. nonspatial memory) affect postural control.
• To determine if these effects are amplified in older adults.

Main Methods:

• 70 participants (aged 20-79) performed postural control tasks (standing still) while undertaking no cognitive task, a spatial memory task, or a nonspatial memory task.
• Cognitive tasks were also performed in a seated position for comparison.
• Postural stability was measured using a force platform; memory recall was assessed.

Main Results:

• Postural stability declined with age, particularly during spatial memory tasks.
• Cognitive task performance (memory recall) declined with age but was unaffected by posture (standing vs. seated).
• Participants were more stable during stimulus encoding (especially spatial) but less stable during stimulus maintenance (especially nonspatial) compared to no cognitive task.

Conclusions:

• Postural stability is not solely automatic and is significantly modulated by concurrent cognitive activity.
• The impact of cognitive tasks on postural control is complex, depending on age, task type (spatial/nonspatial), and processing phase (encoding/maintenance).
• These findings have implications for understanding fall risk and designing interventions for aging populations.