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Brain Imaging Investigation of the Impairing Effect of Emotion on Cognition
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Sex differences in effective fronto-limbic connectivity during negative emotion processing.

Ovidiu Lungu1, Stéphane Potvin2, Andràs Tikàsz2

  • 1Department of Psychiatry, University of Montreal, Montreal, Canada; Centre de Recherche de l'Institut Universitaire de Gériatrie de Montreal, Montreal, Canada; Centre for Research in aging Donald Berman Maimonides Geriatric Centre, Montreal, Canada.

Psychoneuroendocrinology
|August 31, 2015
PubMed
Summary

Men show distinct fronto-limbic brain connectivity during negative emotion processing, influenced by testosterone and gender traits. This suggests a more evaluative brain response in men compared to women.

Keywords:
Effective connectivityEmotionSex steroid hormonesSex/gender differencesfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Psychiatry

Background:

  • Women exhibit higher rates of depression and anxiety disorders than men.
  • Previous functional magnetic resonance imaging (fMRI) studies focused on sex differences in brain activation during emotion processing.
  • Sex differences in fronto-limbic brain connectivity during emotion processing remain under-explored.

Purpose of the Study:

  • Investigate sex differences in fronto-limbic brain connectivity.
  • Examine brain responses during negative emotion processing.

Main Methods:

  • fMRI scans on 46 healthy adults (25 women, 21 men) viewing emotional images.
  • Granger causality and psychophysical interaction analyses to assess effective connectivity.
  • Measurement of sex steroid hormones and feminine-masculine traits.

Main Results:

  • Women rated negative images as more intense than men.
  • Significant activation in dorso-medial prefrontal cortex (dmPFC) and right amygdala observed across sexes.
  • Men exhibited greater Granger connectivity from the right amygdala to the dmPFC during high negative emotion processing, correlated with testosterone levels and inversely with feminine traits.

Conclusions:

  • Highlight significant sex differences in brain connectivity during negative emotion processing.
  • Suggest contributions of biological (sex hormones) and psychosocial (gender) factors.
  • Indicate men may have a more evaluative brain response (dmPFC involvement) versus purely affective (amygdala involvement) compared to women.