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Positive correlation between drowsiness and prefrontal activation during a simulated speed-control driving task.

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  • 1aDepartment of Psychology, Sun Yat-Sen University, Guangzhou, China bDepartment of Cognitive Informatics, Graduate School of Information Science, Nagoya University, Nagoya, Japan.

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Drowsy drivers may increase prefrontal brain activation to maintain performance when controlling speed. Near-infrared spectroscopy can detect drowsiness during real-world driving tasks.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Transportation Safety

Background:

  • Drowsiness significantly impairs driving performance and increases accident risk.
  • Understanding the neural mechanisms of drowsiness is crucial for developing effective countermeasures.
  • Near-infrared spectroscopy (NIRS) offers a portable method for monitoring brain activity during daily activities.

Purpose of the Study:

  • To investigate the relationship between drowsiness and prefrontal cortex (PFC) activation during simulated driving.
  • To explore whether task control (speed control vs. speed-free) influences this relationship.
  • To assess the feasibility of using portable NIRS for drowsiness detection in real-world driving scenarios.

Main Methods:

  • Simulated driving task with two groups: speed-control and speed-free.
  • Drowsiness assessed using a Likert-type questionnaire.
  • Prefrontal activation measured using a wireless portable near-infrared spectroscopy (NIRS) device.
  • Behavioral data (driving time, errors) collected for performance analysis.

Main Results:

  • The speed-control group exhibited longer driving times but no difference in errors compared to the speed-free group.
  • A significant positive correlation between drowsiness scores and left prefrontal activation was observed in the speed-control group.
  • No significant correlation was found between drowsiness and prefrontal activation in the speed-free group.

Conclusions:

  • Increased prefrontal activation in drowsy individuals may represent a compensatory mechanism to maintain performance in tasks requiring deliberate behavioral control.
  • Portable NIRS is a promising tool for monitoring drowsiness during everyday activities like driving.
  • Findings highlight the importance of task demands in modulating the neural correlates of drowsiness.