Abstract
Social avoidance and anxiety are prevalent in fragile X syndrome (FXS) and are potentially mediated by the amygdala, a brain region critical for social behavior. Unfortunately, functional brain resonance imaging investigation of the amygdala in FXS is limited by the difficulties experienced by intellectually impaired and anxious participants. We investigated the relationship between social avoidance and emotion-potentiated startle, a probe of amygdala activation, in children and adolescents with FXS, developmental disability without FXS (DD), and typical development. Individuals with FXS or DD demonstrated significantly reduced potentiation to fearful faces than a typically developing control group (p < .05). However, among individuals with FXS, social avoidance correlated positively with fearful-face potentiation (p < .05). This suggests that general intellectual disability blunts amygdalar response, but differential amygdala responsiveness to social stimuli contributes to phenotypic variability among individuals with FXS.
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Acknowledgments
The authors thank Lori Abucayan, Dr. Aaron Campbell, Susan Harris, Maisha Ollison, Dr. Andrea Schneider and Dr. Jennifer Yuhas-Duffy for their contribution to this research. Additionally, thanks to Dr. David Amaral for his suggestion to examine fear potentiated startle as a probe of amygdala involvement in the fragile X syndrome phenotype. We are especially thankful to the participants and their families for their contribution to the understanding of FXS. This work was supported by National Institute of Mental Health Grant MH7754. A version of this paper was presented at the 8th Annual International Meeting for Autism Research in 2009 and at the 12th Annual International Fragile X Conference in 2010.
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Ballinger, E.C., Cordeiro, L., Chavez, A.D. et al. Emotion Potentiated Startle in Fragile X Syndrome. J Autism Dev Disord 44, 2536–2546 (2014). https://doi.org/10.1007/s10803-014-2125-7
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DOI: https://doi.org/10.1007/s10803-014-2125-7