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Home Opinion & Analysis Columnists

Computer simulations of the brain can predict language recovery in stroke survivors

Tuesday, 8 June 2021, 5:22 pm
in Columnists, Opinion & Analysis
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Computer simulations of the brain can predict language recovery in stroke survivors
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At Boston University, a team of researchers is working to better understand how language and speech are processed in the brain and how to best rehabilitate people who have lost their ability to communicate due to brain damage caused by a stroke, and trauma or another type of brain injury. This type of language loss is called Aphasia, a long term neurological disorder caused by damage of the part of the brain responsible for language production and processing that impact over a million people in the US.

“It is a huge problem”, says Swathi Kiran, director of BU’s Aphasia Researcher Lab, College of Health and Rehabilitation Science and Sargent College associated team for research. It’s something our lab is working to tackle at multiple levels”.

For the last decade, Kiran and her team have studied the brain to see how it changes as people’s language skills improve with speech therapy. More recently, they’ve developed a new method to predict a person’s ability to improve even before they start therapy. In a new paper published in scientific reports, Kiran and collaborators at BU and the University of Texas at Austin report they can predict language recovery in Hispanic patients who speak both English and Spanish fluently- a group of Aphasia patients particularly at risk of long term language loss- using a sophisticated computer model of the brain. They said the breakthrough could be a game-changer for the field of speech therapy, and stroke survivors impacted by Aphasia.

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“This paper uses computational modelling to predict rehabilitation outcomes in a population of neurological disorders that are really underserved,” Kiran said. In the US, Hispanic Stroke Survivors are nearly two times less likely to be insured than all other racial or ethnic groups, Kiran says and therefore they experience greater difficulties in accessing language rehabilitation. On top of that, oftentimes speech therapy is only available in one language, even though patients may speak multiple languages at home, making it difficult for clinicians to prioritize which language a patient should receive therapy in.

“This work started with the question: if someone had a stroke in this country and the patients speak two languages which language should they received therapy in?” Are they more likely to improve if they receive therapy in English? Or in Spanish?.

This first of its kind technology addresses these needs by using sophisticated neural network models that simulate the brain of a bilingual person that is language-impaired and their brain response to the therapy in English and Spanish.

The model can then identify the optimal language to Target during treatment and predict the outcome after therapy to forecast how well a person will recover their language skills. They found that the model predicts treatment effects accurately in the treated language meaning these computational tools could guide healthcare providers to prescribe the best possible rehabilitation plan.

“There is more recognition with the pandemic that people from different population – whether ( those be different of ) race, ethnicity, different disability, socioeconomic status – don’t receive the same level of healthcare says Kiran. The problem we’re trying to solve here is, for our patients, health disparities at their worst, they are from a population that, the data shows do not have great access to care, and they have a communication problem (due to Aphasia).

As part of this work, the team is examining how recovery in one language impact recovery of the other – will learning the word “dog” in English lead to a patient recalling the word “perro” for a dog in Spanish?.

“If you’re bilingual, you may go back and forth between languages, and what we’re trying to do ( in our lab) is use that as a therapy piece,” says Kiran.

A clinical trial using this technology are already underway, which will soon provide an even clearer picture of how the model can potentially be implemented in hospital and clinical setting.

“We are trying to develop effective therapy program, but also try deal with the patient as a whole”, Kiran says. This is why we care deeply about these health disparities and the patient’s overall well-being.

By: Peace Chigozie

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