Heightened Amygdala Activity May Cause Social Deficits in Autism

Author: University of Washington
Published: 2009/03/19 - Updated: 2025/02/20
Publication Details: Peer-Reviewed, Research, Study, Analysis
Topic: ADHD and ADD - Publications List

Page Content: Synopsis - Introduction - Main - Insights, Updates

Synopsis: This report discusses research from the University of Washington revealing that adults with autism exhibit increased activity in the amygdala - a brain region associated with processing emotions and social information - when viewing neutral human faces. This hyperactivity may contribute to the social challenges commonly experienced by individuals with autism. The study, published in The American Journal of Psychiatry, utilized functional magnetic resonance imaging (fMRI) to compare brain responses between adults with autism and neurotypical individuals. Findings indicated that, unlike their neurotypical counterparts, individuals with autism did not show typical neural habituation in the amygdala when repeatedly exposed to the same faces. This suggests a persistent state of hyper-arousal, potentially leading to difficulties in interpreting subtle social cues. Understanding this neural response pattern offers valuable insights into the underlying mechanisms of social deficits in autism, which could inform the development of targeted interventions to improve social functioning for those affected - Disabled World (DW).

Introduction

Researchers at the University of Washington have discovered an increased pattern of brain activity in the amygdalas of adults with autism that may be linked to the social deficits that typically are associated with the disorder. Previous research at the UW and elsewhere has shown that abnormal growth patterns in the amygdala are commonly found among young children diagnosed with autism.

Main Item

Something strange is going on in the amygdala - an almond-shaped structure deep in the human brain - among people with autism.

Researchers at the University of Washington have discovered an increased pattern of brain activity in the amygdalas of adults with autism that may be linked to the social deficits that typically are associated with the disorder. Previous research at the UW and elsewhere has shown that abnormal growth patterns in the amygdala are commonly found among young children diagnosed with autism.

The amygdala is popularly associated with the "fight-or-flight response" in dangerous situations. But it has other functions, including identifying faces and situations and evaluating social information such as emotions.

The new research shows that brain activation in adults with autism remains elevated long after similar brain regions of typically developed adults have stopped being activated when exposed to a series of pictures of human faces. A decrease in activation over time to the same type of information is called neural habituation and is connected with learning, according to Natalia Kleinhans, lead author of the new study and a UW research assistant professor of radiology.

"What we are seeing is hyper-excitability or over-arousal of the amygdala, which suggests that neurons in the amygdala are firing more than expected," said Kleinhans, who is associated with the UW Autism Center.

"If you consider that habituation reflects learning in as simple a task as looking at a face, slowness to habituate in people with autism may contribute even more markedly to difficulty with more complex social interactions and social cognition. If the brain is not reacting typically to a static face with a neutral expression, you can imagine how difficult it may be for someone with autism to pick up more subtle social cues."

The National Institute of Child Health and Human Development and the National Institute of Mental Health funded the research, which appears in the online edition of The American Journal of Psychiatry.

The UW researchers used functional magnetic resonance imaging to examine brain activation in 19 individuals with autism and in a comparison group of 20 healthy adults. The subjects ranged in age from 18 to 44 and the two groups were matched for IQs in the low-normal range. Both groups had their brains scanned while they looked at series of faces with neutral expressions. Each face appeared on a screen for three seconds and occasionally a face would be repeated two consecutive times. When that happened subjects were instructed to push a button.

The scientists were interested in what happened in two brain regions, the amygdala and the fusiform gyrus, when the subjects viewed the faces. It turned out that the fusiform gyrus, which helps determine what kind of object a person is looking at - a face or a house, for example - showed no habituation in either group. But the differences were striking when it came to the amygdala.

"The differences we found were in the amygdala and specific to the amygdala," said Kleinhans. "They originated there and did not go across the brain."

She said one theory about autism is that when this hyperarousal occurs an individual misses important information. Those individuals with autism who had the most social impairment exhibited the highest levels of amygdala arousal.

"This is another piece of evidence that there is something wrong with the amygdala in autism that contributes to social impairment. These results help refine our understanding of functional abnormalities in autism and are a new way of thinking about social dysfunction in autism," said Kleinhans.

Study Authors

Co-authors of the paper, who are all associated with the UW's Autism Center, the radiology department or department of psychosocial and community health, are; L. Clark Johnson, Todd Richards, Roderick Mahurin, Jessica Greenson and Elizabeth Aylward. Geraldine Dawson, founding director of the Autism Center who is now the chief scientific officer of Autism Speaks, also contributed to the paper.

Insights, Analysis, and Developments

These findings offer an important perspective on the neurological basis of social difficulties in autism, shedding light on how differences in amygdala activity may shape real-world interactions. While the study enhances our understanding of autistic brain function, it also raises further questions about how this heightened response to faces develops over time and whether it can be modified. Future research exploring potential therapies or interventions to help individuals with autism manage amygdala hyperactivity could be a valuable next step. For those affected by autism and the professionals who support them, this study underscores the need for approaches that consider not just behavioral differences but also the underlying neurological factors that contribute to social challenges

Attribution/Source(s): This peer reviewed publication was selected for publishing by the editors of Disabled World (DW) due to its relevance to the disability community. Originally authored by University of Washington and published on 2009/03/19, this content may have been edited for style, clarity, or brevity. For further details or clarifications, University of Washington can be contacted at washington.edu NOTE: Disabled World does not provide any warranties or endorsements related to this article.