Transcranial direct current stimulation to dorsolateral prefrontal cortex improves performance of obstacle avoidance...

Area of Science:

• Neuroscience
• Cognitive Science
• Motor Control

Background:

• Dual-tasking, combining cognitive and motor activities, often leads to performance decrements.
• The dorsolateral prefrontal cortex (DLPFC) is implicated in executive functions and cognitive-motor integration.

Purpose of the Study:

• To investigate dual-task interference between cognitive (subtraction) and obstacle avoidance walking tasks.
• To examine the effect of transcranial direct current stimulation (tDCS) on cognitive-motor dual-task performance.

Main Methods:

• Healthy young adults performed single and dual tasks (cognitive and obstacle avoidance) before and after sham or anodal tDCS to the left DLPFC.
• Performance metrics included cognitive accuracy, obstacle clearance height, and foot placement relative to obstacles.
• Repeated-measures ANOVA analyzed the effects of tDCS, time, and task conditions.

Main Results:

• Dual-tasking significantly impacted performance compared to single-tasking.
• Anodal tDCS over the left DLPFC improved cognitive task accuracy (increased correct subtractions).
• tDCS also enhanced motor performance by increasing obstacle clearance height and reducing foot proximity to obstacles.

Conclusions:

• Dual-task performance in complex walking scenarios is causally linked to left DLPFC activation.
• Anodal tDCS over the left DLPFC can improve information processing capacity during overloaded cognitive-motor tasks.