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2015 ; 6
(ä): 54
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English Wikipedia
Insistence on sameness relates to increased covariance of gray matter structure
in autism spectrum disorder
#MMPMID26435832
Eisenberg IW
; Wallace GL
; Kenworthy L
; Gotts SJ
; Martin A
Mol Autism
2015[]; 6
(ä): 54
PMID26435832
show ga
BACKGROUND: Autism spectrum disorder (ASD) is characterized by atypical
development of cortical and subcortical gray matter volume. Subcortical
structural changes have been associated with restricted and repetitive behavior
(RRB), a core component of ASD. Behavioral studies have identified insistence on
sameness (IS) as a separable RRB dimension prominent in high-functioning ASD,
though no simple brain-behavior relationship has emerged. Structural covariance,
a measure of morphological coupling among brain regions using magnetic resonance
imaging (MRI), has proven an informative measure of anatomical relationships in
typical development and neurodevelopmental disorders. In this study, we use this
measure to characterize the relationship between brain structure and IS. METHODS:
We quantified the structural covariance of cortical and subcortical gray matter
volume in 55 individuals with high-functioning ASD using 3T MRI. We then related
these structural metrics to individual IS scores, as assessed by the Repetitive
Behavior Scale-Revised (RBS-R). RESULTS: We found that increased coupling among
subcortical regions and between subcortical and cortical regions related to
greater IS symptom severity. Most pronounced, the striatum and amygdala
participated in a plurality of identified relationships, indicating a central
role for these structures in IS symptomatology. These structural associations
were specific to IS and did not relate to any of the other RRB subcomponents
measured by the RBS-R. CONCLUSIONS: This study indicates that behavioral
dimensions in ASD can relate to the coordination of development across multiple
brain regions, which might be otherwise obscured using typical brain-behavior
correlations. It also expands the structures traditionally related to RRB in ASD
and provides neuroanatomical evidence supportive of IS as a separate RRB
dimension. TRIAL REGISTRATION: ClinicalTrials.gov NCT01031407.