Cognitive performance under motor demands - On the influence of task difficulty and postural control

Area of Science:

• Neuroscience
• Cognitive Psychology
• Motor Control

Background:

• Cognitive and motor performance are often studied separately.
• Understanding the interplay between motor demands and cognitive task difficulty is limited.
• Previous research lacks combined neurophysiological and behavioral data on motor-cognitive interactions.

Purpose of the Study:

• To investigate how motor task difficulty influences cognitive task performance.
• To explore the neurophysiological underpinnings of motor-cognition interactions.
• To examine the combined effects of physical balance and cognitive load on brain activity.

Main Methods:

• 20 healthy participants performed cognitive tasks of varying difficulty while sitting or standing on one leg.
• Electroencephalogram (EEG) data were recorded from 26 scalp electrodes.
• Behavioral data and EEG signals were analyzed during specific time windows (P2: 200-300 ms, P3: 350-500 ms).

Main Results:

• A significant motor × cognition interaction was found in the early time window (P2).
• The difficult cognitive task showed a more pronounced brain response (P2 positivity) during the one-legged stance condition.
• The later time window (P3) showed main effects of the motor task and a trend for the cognitive task.

Conclusions:

• The challenging motor task of standing on one leg appears to facilitate cognitive processing, particularly for difficult tasks.
• The observed motor-cognition interaction in the P2 suggests a neural mechanism where motor demand can enhance cognitive function.
• Findings highlight the importance of considering motor context in cognitive neuroscience research.