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High-definition Transcranial Direct Current Stimulation over Right Dorsolateral Prefrontal Cortex to Enhance Metacognitive Sensitivity
Published on: September 26, 2025
Enhancing vigilance in operators with prefrontal cortex transcranial direct current stimulation (tDCS)
Jeremy T Nelson1, R Andy McKinley, Edward J Golob
1Neuroscience Program, Tulane University, 6400 Freret St., New Orleans, LA 70118, USA; Booz Allen Hamilton, 700N. St. Mary's St, Suite 700, San Antonio, TX 78205, USA.
Neuroimage
|December 14, 2012
Summary
Transcranial direct current stimulation (tDCS) improved sustained attention and reduced performance decline during vigilance tasks. This brain stimulation technique modulated frontal cortex activity, offering potential benefits for attention-related disorders.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neuromodulation
Background:
- Sustained attention, or vigilance, is crucial for goal-directed tasks but declines with prolonged engagement (vigilance decrement).
- The dorsolateral prefrontal cortex plays a key role in maintaining vigilance.
- Understanding the neural mechanisms of the vigilance decrement is essential for developing interventions.
Purpose of the Study:
- To investigate the role of the dorsolateral prefrontal cortex in the vigilance decrement.
- To examine the effects of prefrontal transcranial direct current stimulation (tDCS) on vigilance performance and associated physiological changes.
Main Methods:
- Nineteen subjects underwent prefrontal tDCS at different time points during a vigilance task.
- Behavioral measures (target detection, reaction time) and cerebral blood flow velocity/oxygenation were recorded.
- Stimulation effects were compared against a sham condition, with analysis of signal detection parameters and tDCS current density modeling.
Main Results:
- The sham condition exhibited a typical vigilance decrement (decreased detection, increased reaction time, reduced blood flow velocity).
- tDCS mitigated the vigilance decrement, showing less decrease in blood flow velocity and increased cerebral oxygenation compared to sham.
- Behavioral measures indicated significant improvements in target detection with tDCS, with signal detection analysis revealing altered discriminability and response bias.
Conclusions:
- Cerebral hemodynamic measures reflect cognitive resource utilization during sustained attention.
- Modulating frontal cortex activity via tDCS influences the availability of vigilance resources, impacting performance.
- tDCS shows promise for mitigating performance degradation in sustained attention tasks and potentially treating related neurological/psychiatric disorders.
