How does language capacity recover right after a stroke?

July 17, 2014
Stephen Wilson takes images of study participants' brains using a state-of-the-art MRI scanner acquired by the UA only last year. Housed in the newly improved medical imaging facility, this scanner is exclusively dedicated to research. Credit: Daniel Stolte/UANews

An interdisciplinary group of researchers at the University of Arizona has been awarded a $2 million grant from the National Institutes of Health to study language abilities in patients recovering from a stroke. The findings are expected to guide the development of treatments that would help patients regain as much of their language skills as possible.

"Speaking and comprehending is something we take for granted. But when you think about the complexity of language, it's actually a very complicated process our brain has to carry out," said Stephen Wilson, an assistant professor in the UA Department of Speech, Language and Hearing Sciences and the principal investigator of the study. "There are several brain regions, mostly in the left hemisphere, that we know are important for speech and language. When one of these areas is damaged, you get aphasia."

One of the most common and debilitating consequences of a stroke is the loss of the ability to speak, read or write. Collectively referred to as aphasia, such acquired communication disorders affect about 1 million Americans.

Aphasia comes in many different forms. Depending on which part of the brain is affected, a patient may have difficulty producing spoken or written language, or a patient may speak rather fluently but have trouble retrieving the names for people and everyday objects, or in putting together sentences.

Unlike most previous studies on aphasia, which have looked at the effects of stroke on language six months to a year later, or have relied on a specific imaging technique to image the brain, the UA scientists are going to work with patients in the first three months after a stroke, and will combine language assessments with a comprehensive battery of brain imaging techniques.

"We know that a lot happens in those early days, weeks and months," Wilson said. "The greatest behavioral gains take place during this time – even when patients do not receive treatment – and by looking at the natural recovery process during that time, we can potentially understand more about what neural processes underlie successful recovery."

Depending on the severity of the stroke and the affected regions, the brain is able to restore some or nearly all language functions through rewiring of neural circuits or transferring language-processing tasks to regions unaffected by the stroke. The researchers hope to shed light on why some patients recover most or nearly all language functions, while others make few gains and remain chronically aphasic. A better understanding of the in successful recovery will improve the accuracy of prognoses, in other words, help doctors better predict the prognosis of stroke patients. This should lead to better medical treatments and behavioral interventions.

"It has been a challenge to study treatment before we understand the natural course of recovery," Wilson explained. "It's not really known whether it's a good idea to start treatment right away or whether it's better to wait."

The UA study will evaluate patients' language performance and simultaneously look at their brains with different imaging techniques to yield the best insight of the brain and how it functions in the wake of a stroke with regard to language tasks.

"If you want to know what is going on in the damaged brain, you have to look at it from all different angles," Wilson said. "We need to bring all of those to bear because any single one of them will show us only part of the picture."

The team will be analyzing the conditions under which patients improve and how quickly it happens, he said.

"In doing so, we hope to understand what is changing in their , what is changing in their language, and how those are related."

The five-year grant is administered through the National Institute on Deafness and Other Communication Disorders, which is part of NIH.

Wilson noted the combination of the UA's interdisciplinary academic culture and its world-class medical imaging facility. His department – part of the School of Mind, Brain and Behavior in the UA College of Science – has been ranked among the best in the U.S. for more than 25 years and has long been a leader in the study of stroke and aphasia treatment. This new study complements several research projects being conducted through the department that involve patients later in their recovery.

"This new project will provide a much richer understanding of the early recovery process for individuals, and will inform the rehabilitation work that we implement at later stages," said Pélagie Beeson, one of the collaborators on the study and head of the Department of Speech, Language and Hearing Sciences. Beeson is the lead investigator on a long-running research project focused on the development behavioral treatments to maximize the recovery from spoken and written language impairment after stroke.

Wilson said the UA study could lay the groundwork for clinical trials directed at new treatment strategies.

"Right now it would be hard to do a treatment trial of acute stroke, because we don't have a good sense of the natural course of recovery after stroke," Wilson said. "Things change very rapidly. If you were investigating a potential treatment strategy, and you tested someone one week after the and again three weeks later, you would probably see substantial gains, but right now you wouldn't have any way of knowing whether those gains were due to the treatment or just represented the natural course of recovery."

The project brings together researchers on the language side and the neurology side, along with imaging experts. The co-investigators are Steven Rapcsak and Chelsea Kidwell, both professors in the UA Department of Neurology, and Kambiz Nael, assistant professor in the UA Department of Medical Imaging.

Undergraduates also have played a role, Wilson said.

"We couldn't have made this happen without the work of our outstanding undergraduate research students, who were instrumental in working with patients to gather the pilot data that helped us win this grant."

Explore further: Teaching the brain to speak again

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