Abstract
Autism is a neurodevelopmental disorder characterized by pervasive deficits in language, behavior, and cognition. Pathology exists throughout the brains of subjects with autism including the cerebellum. These abnormalities include changes in cerebellar and vermal volume, changes in pyramidal cell density, and changes in gray and white matter. Additionally, a number of brain markers associated with GABAergic function, brain development, inflammation, oxidative stress, immune system function, and apoptosis have shown altered expression in the cerebellum of subjects with autism. Initially, it was thought that cerebellar pathology contributed mainly to impaired motor function in autism. Over the past 20 years, however, there has been an increased understanding that the cerebellum is involved in emotional processing, cognition, and other higher brain functions, many of which are impaired in autism. Ataxia, or abnormal gait, is often accompanied by degeneration of the cerebellum. Moreover, similar to autism, ataxia is often associated with deficits in executive function, emotional processing, and cognition. The purpose of this chapter is to summarize findings of cerebellar pathology in autism and how cerebellar pathology may contribute to the behavioral and cognitive aspects of autism and ataxia.
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Acknowledgments
Funding from NIH (5R01HD052074-04 and 3R01HD052074-03S1) to SHF is gratefully acknowledged. SH Fatemi has also been supported by Bernstein Endowment in Adult Psychiatry and the Winston and Maxine Wallin Neuroscience Discovery Fund.
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Folsom, T.D., Fatemi, S.H. (2020). Autism Spectrum Disorders and Ataxia. In: Manto, M., Gruol, D., Schmahmann, J., Koibuchi, N., Sillitoe, R. (eds) Handbook of the Cerebellum and Cerebellar Disorders. Springer, Cham. https://doi.org/10.1007/978-3-319-97911-3_87-2
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