Abstract
This study introduces an objective neurophysiological marker of language ability, the integral of event-related desynchronization in the 5–20 Hz band during 0.2–1 seconds post auditory stimulation with interleaved word/non-word tokens. This measure correlates with clinical assessment of language function in both ASD and neurotypical pediatric populations. The measure does not appear related to general cognitive ability nor autism symptom severity (beyond degree of language impairment). We suggest that this oscillatory brain activity indexes lexical search and thus increases with increased search in the mental lexicon. While specificity for language impairment in ASD remains to be determined, such an objective index has potential utility in low functioning individuals with ASD and young children during language acquisition.
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Acknowledgments
We would like to the thank all of the participants and their families for their cooperation and for participating in this study. This work was supported in part by NIH R01DC008871 (TR), NIH R01HD073258 (DE), NIH K01MH108762 (LB) and NIH U54HD086984, the institutional IDDRC (TR directs the Neuroimaging Neurocircuitry Core).
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LB, Ph.D. is a Research Scientist at the Lurie Family Foundations MEG Imaging Center at the Children’s Hospital of Philadelphia (CHOP). KS, Ph.D. is a Post-Doctoral Researcher in the Radiology Department at CHOP and a Visiting Scholar in the Department of Linguistics at the University of Pennsylvania. LB, PhD, is a pediatric neuropsychologist in the Department of Child and Adolescent Psychiatry and Behavioral Sciences, the Center for Autism Research, and the Autism Integrated Care Program at CHOP. TPLR, PhD, is a professor of Radiology, Vicechair of Research for the Department of Radiology and the Oberkircher Family Endowed Chair in Pediatric Radiology at CHOP. DE, Ph.D. is a professor and chair of the Department of Linguistics at the University of Pennsylvania.
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Dr. Roberts declares consulting agreements (medical advisory boards) with CTF MEG, Ricoh, Spago Nanomedicine, Avexis Inc. and Acadia Pharmaceuticals as well as intellectual property under licensing negotiation. Drs. Bloy, Shwayder, Blaskey and Embick declare no conflicts of interest.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee, and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Written informed consent was obtained from all participant’s families and each participant (when competent to do so) gave verbal assent to participate in the study.
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Glossary
- ERD
-
Event related desynchrony—task related decreases in oscillatory power relative to baseline
- ERS
-
Event related synchrony—task related increases in oscillatory power relative to baseline
- MEG
-
Magnetoencephalography
- EEG
-
Electroencephalography
- ASD
-
Autism spectrum disorder
- TD
-
Typically developing
- M50/M100
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Prominent middle and late components of the auditory evoked field
- Lexical
-
Relating to the words or vocabulary
- Theta Band
-
Oscillatory activity between 4 and 6 Hz
- Alpha Band
-
Oscillatory activity between 8 and 12 Hz
- Beta Band
-
Oscillatory activity between 13 and 30 Hz
- Gamma Band
-
Oscillatory activity above 30 Hz (typically below 100 Hz)
- STG
-
Superior temporal gyrus
- ADOS-CSS
-
Calibrated severity score derived from the autism diagnostic observation schedule
- PRI
-
Perceptual reasoning index from the wechsler intelligence scale for children-IV
- CELF-CLSS
-
Core language standard score from the clinical evaluation of language fundamentals
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Bloy, L., Shwayder, K., Blaskey, L. et al. A Spectrotemporal Correlate of Language Impairment in Autism Spectrum Disorder. J Autism Dev Disord 49, 3181–3190 (2019). https://doi.org/10.1007/s10803-019-04040-x
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DOI: https://doi.org/10.1007/s10803-019-04040-x