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Amygdalar reactivity is associated with prefrontal cortical thickness in a large population-based sample of adolescents

  • IMAGEN Consortium
  • University of Vermont
  • McGill University
  • Universitatsklinikum Mannheim
  • Department of Urology
  • Universitatsklinikum Hamburg-Eppendorf und Medizinische Fakultat
  • MRC Medical Research Council
  • Heidelberg University
  • Université Paris-Saclay
  • University of Nottingham
  • Institute for Radiology, CCM
  • Physikalisch-Technische Bundesanstalt
  • University of Paris XI - University of Paris-Sud
  • University Health Network, Toronto
  • University Medical Center Göttingen
  • TU Dresden

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
158 Downloads (Pure)

Abstract

In structural neuroimaging studies, reduced cerebral cortical thickness in orbital and ventromedial prefrontal regions is frequently interpreted as reflecting an impaired ability to downregulate neuronal activity in the amygdalae. Unfortunately, little research has been conducted in order to test this conjecture. We examine the extent to which amygdalar reactivity is associated with cortical thickness in a population-based sample of adolescents. Data were obtained from the IMAGEN study, which includes 2,223 adolescents. While undergoing functional neuroimaging, participants passively viewed video clips of a face that started from a neutral expression and progressively turned angry, or, instead, turned to a second neutral expression. Left and right amygdala ROIs were used to extract mean BOLD signal change for the angry minus neutral face contrast for all subjects. T1-weighted images were processed through the CIVET pipeline (version 2.1.0). In variable-centered analyses, local cortical thickness was regressed against amygdalar reactivity using first and second-order linear models. In a follow-up person-centered analysis, we defined a “high reactive” group of participants based on mean amygdalar BOLD signal change for the angry minus neutral face contrast. Between-group differences in cortical thickness were examined (“high reactive” versus all other participants). A significant association was revealed between the continuous measure of amygdalar reactivity and bilateral ventromedial prefrontal cortical thickness in a second-order linear model (p < 0.05, corrected). The “high reactive” group, in comparison to all other participants, possessed reduced cortical thickness in bilateral orbital and ventromedial prefrontal cortices, bilateral anterior temporal cortices, left caudal middle temporal gyrus, and the left inferior and middle frontal gyri (p < 0.05, corrected). Results are consistent with non-human primate studies, and provide empirical support for an association between reduced prefrontal cortical thickness and amygdalar reactivity. Future research will likely benefit from investigating the degree to which psychopathology qualifies relations between prefrontal cortical structure and amygdalar reactivity.

Original languageEnglish
Article numbere0216152
Number of pages16
JournalPLoS ONE
Volume14
Issue number5
DOIs
Publication statusPublished - 2 May 2019

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