Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Email this article to a Colleague Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to My Articles & Searches Download to citation manager Citing Articles via HighWire Citing Articles via Google Scholar Articles by Haznedar, M. M. Articles by Hollander, E. Search for Related Content PubMed Citation Articles by Haznedar, M. M. Articles by Hollander, E. fMR Autism Other Childhood Disorders PET

Volumetric Analysis and Three-Dimensional Glucose Metabolic Mapping of the Striatum and Thalamus in Patients With Autism Spectrum Disorders

OBJECTIVE: In patients with autism, behavioral deficits as well as neuroimaging studies of the anterior cingulate cortex suggest ventral rather than dorsal striatal and thalamic abnormalities in structure and function. The authors used imaging studies to map volumetric and metabolic differences within the entire dorsoventral extent of the striatum and thalamus. METHOD: Magnetic resonance imaging (MRI) and positron emission tomography (PET) were used to measure volumes and metabolic activity in the thalamus, caudate, and putamen in 17 patients with autism or Asperger’s disorder and 17 age- and sex-matched comparison subjects. Subjects performed a serial verbal learning test during the [¹⁸F]-fluorodeoxyglucose uptake period. The regions of interest were outlined on contiguous axial MRI slices. After PET/MRI coregistration, region-of-interest coordinates were applied to the PET scan for each individual. Between-group differences in metabolism were assessed by three-dimensional statistical probability mapping. RESULTS: The patients with autism spectrum disorders had greater volumes of the right caudate nucleus than comparison subjects as well as a reversal of the expected left-greater-than-right hemispheric asymmetry. Patients also had lower relative glucose metabolic rates bilaterally in the ventral caudate, putamen, and thalamus. Patients with autism had lower metabolic activity in the ventral thalamus than those with Asperger’s disorder, but they did not differ from comparison subjects in metabolic activity in the caudate nucleus. CONCLUSIONS: These results are consistent with a deficit in the anterior cingulate-ventral striatum-anterior thalamic pathway in patients with autism spectrum disorders. The results also suggest an important role for the caudate in helping support working-memory demands.

This article has been cited by other articles:

				N. Schmitz, K. Rubia, T. van Amelsvoort, E. Daly, A. Smith, and D. G.M. Murphy Neural correlates of reward in autism The British Journal of Psychiatry, January 1, 2008; 192(1): 19 - 24. [Abstract] [Full Text] [PDF]

Get information about faster international access.

Privacy Policy

Copyright © 2006 American Psychiatric Association. All rights reserved.

Home | Search | Current Issue | Past Issues | Subscribe | All APPI Journals | Help | Contact Us