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Association between Scale-Free Brain Dynamics and Behavioral Performance: Functional MRI Study in Resting State and

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Brain activity exhibits scale-free dynamics, measured by the power-law exponent (PLE). This study found PLE decreases during face tasks in the medial prefrontal cortex, correlating with reaction time.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Dynamics

Background:

  • Human brain activity exhibits scale-free dynamics with a complex temporal structure.
  • Power-law exponents (PLE) quantify these dynamics, with prior fMRI studies noting lower PLE during cognitive tasks versus rest.
  • The modulation of PLE during cognitive tasks and its behavioral correlates remain underexplored.

Purpose of the Study:

  • To investigate power-law exponent (PLE) modulation during resting state and face processing tasks.
  • To examine the relationship between PLE and behavioral measures, specifically mean reaction time (mRT).
  • To understand the link between spontaneous and task-evoked brain activity dynamics and cognitive performance.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • The study included a resting state condition and a face processing plus control task.
  • Power-law exponent (PLE) was calculated for both conditions, and mean reaction time (mRT) was recorded during the task.

Main Results:

  • BOLD signal changes during face discrimination were observed in the medial prefrontal cortex (mPFC), posterior cingulate cortex (PCC), amygdala, and fusiform face area.
  • A significant decrease in PLE was found in the mPFC during task-evoked activity compared to resting state.
  • In the mPFC, mRT showed a significant negative correlation with both resting state PLE and the difference in PLE between resting and task states.

Conclusions:

  • Task-evoked activity in the mPFC exhibits reduced scale-free dynamics compared to the resting state.
  • The findings suggest a relationship between the scale-free dynamics of brain activity in the mPFC and cognitive performance, as indicated by reaction time.
  • This research offers insights into the association between brain activity dynamics and task performance parameters.