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Structural basis for autism disorders

Date:
August 26, 2010
Source:
University of Nevada, Reno
Summary:
There is still much that is unknown about autism, but a psychologist has completed a six-year study of brain tissue that, for the first time, provided physical evidence of short-range over-connectivity in the outer layer of the brain's cortex in those with autism.

There is still much that is unknown about autism spectrum disorders, but a University of Nevada, Reno psychologist has added to the body of knowledge that researchers around the world are compiling to try to demystify, prevent and treat the mysterious condition.

"Autism is a unique developmental disability," states Jeffrey Hutsler, assistant professor of psychology at the University of Nevada, Reno, who recently completed a six-year study of brain tissue that, for the first time, provided physical evidence of short-range over-connectivity in the outer layer of the brain's cortex in those with autism disorders.

"It creates a lot of noise in the brain, so to speak," he explained. "There was a higher density of synaptic connections, about 20 percent."

Although this short-range over-connectivity had been hypothesized, Hutsler is the first to examine postmortem tissue samples and provide physical evidence of the condition. His research was published recently in the journal, Brain Research. He says his study supports the types of treatments the University is providing at its Early Childhood Autism Program, with early intervention behavioral therapies.

"This is in the layer of the cortex that is one of the last to develop, and a lot of these connections are refined after birth up to about age 4," Hutsler explained. "As you interact with the environment, you sculpt them out."

Those with autism are typically detached from their environment. Hutsler said that their interaction with the environment, or lack thereof, may interfere with that sculpting process. Early intervention with behavioral therapy during the preschool years may be able to aid that sculpting or weeding-out process.

Working mostly with 2- to 5-year-olds, tutors at the University's Early Childhood Autism Program spend a minimum of 30 hours per week, one-on-one with each child for at least two years. The tutors, graduate and undergraduate students who are under faculty supervision, use applied behavior analysis, employing positive reinforcement techniques that strengthen appropriate interaction and behavior, as well as decrease inappropriate behavior.

The program is very effective, with virtually all participants showing improvement and about 50 percent showing total recovery from the disorder, meaning they are indistinguishable from their peers when they enter elementary school, according to the program's director, Patrick Ghezzi.

In fact, Ghezzi has been asked to speak about the methods and the UNR Early Childhood Autism Program throughout the world, and has helped to start other programs modeled after Nevada's in countries such as Jordan, Saudi Arabia, German and Portugal. The University's doctoral program in behavior analysis is one of a handful of such accredited programs in the country. Victoria Follette, chair of the University's psychology department, says that research such as Hutsler's is part of her department's increased emphasis in neuroscience research.

"Research in these areas is key to providing the scientific foundation for our understanding of this disorder and has both local and international implications in the treatment of autism," she states.

Ghezzi is glad to have Hutsler, who joined the University in 2006, as part of the University's psychology and autism research team, stating, "He's at the frontier of research in the biomedical field."

Hong Zhang, now a faculty member at Wuhan University in China, co-authored the study with Hutsler when he was a post-doctoral student of Hutsler's. Hutsler and Zhang credit the National Alliance for Autism Research for providing funding for the study, and also are grateful to the Autism Tissue Program, the Harvard Brain Tissue Resource Center and the Tissue Bank for Developmental Disorders at the University of Miami for their assistance with the study.


Story Source:

The above story is based on materials provided by University of Nevada, Reno. Note: Materials may be edited for content and length.


Journal Reference:

  1. Jeffrey J. Hutsler, Hong Zhang. Increased dendritic spine densities on cortical projection neurons in autism spectrum disorders. Brain Research, 2010; 1309: 83 DOI: 10.1016/j.brainres.2009.09.120

Cite This Page:

University of Nevada, Reno. "Structural basis for autism disorders." ScienceDaily. ScienceDaily, 26 August 2010. <www.sciencedaily.com/releases/2010/08/100825174116.htm>.
University of Nevada, Reno. (2010, August 26). Structural basis for autism disorders. ScienceDaily. Retrieved August 23, 2014 from www.sciencedaily.com/releases/2010/08/100825174116.htm
University of Nevada, Reno. "Structural basis for autism disorders." ScienceDaily. www.sciencedaily.com/releases/2010/08/100825174116.htm (accessed August 23, 2014).

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