Auditory encoding abnormalities in children with autism spectrum disorder suggest delayed development of auditory cortex.

Philadelphia Inquirer Features CAR's Virtual Reality Study
in Partnership with Philadelphia Police
Read more and learn how you can help!
 

TitleAuditory encoding abnormalities in children with autism spectrum disorder suggest delayed development of auditory cortex.
Publication TypeJournal Article
Year of Publication2015
AuthorsJ Edgar, C, Iv, CLFisk, Berman, JI, Chudnovskaya, D, Liu, S, Pandey, J, Herrington, JD, Port, RG, Schultz, RT, Roberts, TPL
JournalMol Autism
Volume6
Pagination69
Date Published2015
ISSN2040-2392
Abstract

BACKGROUND: Findings of auditory abnormalities in children with autism spectrum disorder (ASD) include delayed superior temporal gyrus auditory responses, pre- and post-stimulus superior temporal gyrus (STG) auditory oscillatory abnormalities, and atypical hemispheric lateralization. These abnormalities are likely associated with abnormal brain maturation. To better understand changes in brain activity as a function of age, the present study investigated associations between age and STG auditory time-domain and time-frequency neural activity.METHODS: While 306-channel magnetoencephalography (MEG) data were recorded, 500- and 1000-Hz tones of 300-ms duration were binaurally presented. Evaluable data were obtained from 63 typically developing children (TDC) (6 to 14 years old) and 52 children with ASD (6 to 14 years old). T1-weighted structural MRI was obtained, and a source model created using single dipoles anatomically constrained to each participant's left and right STG. Using this source model, left and right 50-ms (M50), 100-ms (M100), and 200-ms (M200) time-domain and time-frequency measures (total power (TP) and inter-trial coherence (ITC)) were obtained.RESULTS: Paired t tests showed a right STG M100 latency delay in ASD versus TDC (significant for right 500 Hz and marginally significant for right 1000 Hz). In the left and right STG, time-frequency analyses showed a greater pre- to post-stimulus increase in 4- to 16-Hz TP for both tones in ASD versus TDC after 150 ms. In the right STG, greater post-stimulus 4- to 16-Hz ITC for both tones was observed in TDC versus ASD after 200 ms. Analyses of age effects suggested M200 group differences that were due to a maturational delay in ASD, with left and right M200 decreasing with age in TDC but significantly less so in ASD. Additional evidence indicating delayed maturation of auditory cortex in ASD included atypical hemispheric functional asymmetries, including a right versus left M100 latency advantage in TDC but not ASD, and a stronger left than right M50 response in TDC but not ASD.CONCLUSIONS: Present findings indicated maturational abnormalities in the development of primary/secondary auditory areas in children with ASD. It is hypothesized that a longitudinal investigation of the maturation of auditory network activity will indicate delayed development of each component of the auditory processing system in ASD.

DOI10.1186/s13229-015-0065-5
Alternate JournalMol Autism
PubMed ID26719787
PubMed Central IDPMC4696177
Grant ListR01 DC008871 / DC / NIDCD NIH HHS / United States
R21 MH098204 / MH / NIMH NIH HHS / United States
K08 MH085100 / MH / NIMH NIH HHS / United States
RC1 MH088791 / MH / NIMH NIH HHS / United States
U54 HD086984 / HD / NICHD NIH HHS / United States
Comments
Leave a Comment