Honors Theses

Date of Award

Spring 5-9-2024

Document Type

Undergraduate Thesis

Department

Communication Sciences and Disorders

First Advisor

Toshikazu Ikuta

Second Advisor

Myriam Kornisch

Third Advisor

Lainy Day

Relational Format

Thesis

Abstract

Autism spectrum disorder (ASD) is a neurological developmental disorder that affects around 1/44 of individuals in the United States. ASD individuals tend to struggle with things such as communication and socialization. This disorder has been found to affect many brain regions; however, autism’s effect on the hippocampus has been heavily understudied. Since the hippocampus is not commonly referred to as the brain region affected by autism, the importance of the hippocampus in ASD may have been unrecognized. While ASD hippocampi have been very narrowly researched (only size and shape), there is compelling evidence that the hippocampus could be another part of the brain that is different in autism. The physiological difference of the hippocampi has not been well studied. Here, the resting-state functional connectivity of the hippocampus was examined to elucidate the physiological difference between neurotypical and ASD hippocampi. Using two subsets of data (a Michigan and Pittsburgh study), this study analyzed the resting-state functional connectivity of hippocampi in an ASD and control group. A voxel-wise analysis was utilized to examine the hippocampal connectivity to the entire brain. From this study, it was determined that there is less connectivity between the hippocampus and the posterior cingulate gyrus in the ASD group. iv

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