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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychophysiology

Background:

  • Understanding brain activity under stress and high cognitive load is crucial for mental state assessment.
  • Previous research indicates distinct neural network responses to workload and stressors.

Purpose of the Study:

  • To investigate brain activation patterns and autonomic responses during high mental workload with auditory stressors.
  • To explore the interplay between the executive control network (ECN), salience network (SN), and default mode network (DMN) under stress.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity in 20 participants.
  • Participants performed a complex cognitive task under safe and aversive (auditory stressor) conditions.
  • Autonomic measures including heart rate and pupil diameter were recorded.

Main Results:

  • Increased mental workload engaged the lateral frontoparietal ECN and disengaged DMN regions.
  • Auditory stressors led to enhanced ECN activity and deactivations in limbic SN regions.
  • Task performance was maintained under stress due to inhibition of auditory regions (superior temporal gyri).

Conclusions:

  • The balance between ECN, SN, and DMN recruitment can serve as an objective measure of mental state.
  • Increased lateral prefrontal activity indicates efficient mental effort, while medial prefrontal deactivation suggests overload or disengagement.