Mode of Anisotropy Reveals Global Diffusion Alterations in Attention-Deficit/Hyperactivity Disorder

Yuliya N. Yoncheva, Krishna Somandepalli, Philip T. Reiss, Clare Kelly, Adriana Di Martino, Mariana Lazar, Juan Zhou, Michael P. Milham, F. Xavier Castellanos

Research output: Contribution to journalArticlepeer-review

Abstract

Objective Diffusion tensor imaging (DTI) can identify structural connectivity alterations in attention-deficit/hyperactivity disorder (ADHD). Most ADHD DTI studies have concentrated on regional differences in fractional anisotropy (FA) despite its limited sensitivity to complex white matter architecture and increasing evidence of global brain differences in ADHD. Here, we examine multiple DTI metrics in separate samples of children and adults with and without ADHD with a principal focus on global between-group differences. Method Two samples: adults with ADHD (n = 42) and without (n = 65) and children with ADHD (n = 82) and without (n = 80) were separately group matched for age, sex, and head motion. Five DTI metrics (FA, axial diffusivity, radial diffusivity, mean diffusivity, and mode of anisotropy) were analyzed via tract-based spatial statistics. Group analyses tested for diagnostic differences at the global (averaged across the entire white matter skeleton) and regional level for each metric. Results Robust global group differences in diffusion indices were found in adults, with the largest effect size for mode of anisotropy (MA; Cohen's d = 1.45). Global MA also differed significantly between groups in the pediatric sample (d = 0.68). In both samples, global MA increased classification accuracy compared to the model with clinical Conners' ADHD ratings alone. Regional diagnostic differences did not survive familywise correction for multiple comparisons. Conclusion Global DTI metrics, particularly the mode of anisotropy, which is sensitive to crossing fibers, capture connectivity abnormalities in ADHD across both pediatric and adult samples. These findings highlight potential diffuse white matter microarchitecture differences in ADHD.

Original languageEnglish
Pages (from-to)137-145
Number of pages9
JournalJournal of the American Academy of Child and Adolescent Psychiatry
Volume55
Issue number2
DOIs
StatePublished - 1 Feb 2016
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by R01MH081218, R01MH083246, R01HD065282, R01MH091140, T32MH067763, and grants from the Stavros Niarchos Foundation.

Publisher Copyright:
© 2016 American Academy of Child and Adolescent Psychiatry.

Keywords

  • DTI
  • Key words ADHD
  • adults
  • biomarkers
  • fractional anisotropy

ASJC Scopus subject areas

  • Developmental and Educational Psychology
  • Psychiatry and Mental health

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