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Prefrontal cortex glutamate and extraversion.

Simone Grimm1, Florian Schubert, Maren Jaedke

  • 1Cluster of Excellence 'Languages of Emotion', Freie Universität Berlin, Habelschwerdter Allee 45, 14195 Berlin, Germany. simone.grimm@fu-berlin.de

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Introverts show higher glutamate levels in the dorsolateral prefrontal cortex (DLPFC) compared to extraverts. This finding in personality research suggests altered brain function related to extraversion and anxiety.

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Area of Science:

  • Neuroscience
  • Psychology
  • Personality Research

Background:

  • Extraversion is a core personality trait linked to affective and anxiety disorders.
  • Brain imaging studies associate extraversion, approach behavior, and positive emotions with the dorsolateral prefrontal cortex (DLPFC) and glutamate.
  • The direct relationship between extraversion and DLPFC glutamate levels remains unexplored.

Purpose of the Study:

  • To investigate the association between extraversion and glutamate concentrations in the human DLPFC.
  • To explore potential differences in DLPFC glutamate levels between individuals with high and low extraversion.

Main Methods:

  • Utilized 3-Tesla proton magnetic resonance spectroscopy (1H-MRS) to measure absolute glutamate concentrations.
  • Compared glutamate levels in the DLPFC and the visual cortex (control region) of 29 subjects.
  • Categorized subjects into high and low extraversion groups.

Main Results:

  • Introverts exhibited significantly higher glutamate levels in the DLPFC compared to extraverts.
  • Elevated DLPFC glutamate in introverts was specific to this region and negatively correlated with state anxiety.
  • Preliminary findings suggest altered top-down control in the DLPFC related to glutamate levels and extraversion.

Conclusions:

  • Glutamate levels in the DLPFC differ based on extraversion, with introverts showing higher concentrations.
  • These findings may offer insights into the neurobiological underpinnings of personality traits and associated psychiatric conditions.
  • 1H-MRS measurement of glutamate could aid in understanding disorders related to approach behavior and emotional regulation.