The right strokes for some folks

 作者:仓谙     |      日期:2019-03-07 04:01:09
By Alison Motluk A STROKE has cured an elderly man of his lifelong stutter, according to doctors in Japan. The finding might help pinpoint the circuit that goes awry in the brains of people with this speech impediment. Neurologist Akiko Muroi of Fukushima Medical University and her colleagues treated a 66-year-old man who arrived at the hospital in a deep coma. When he came to a few days later, his family was astonished to find that his speech was completely fluent after a lifetime of stammering. His personality also changed from taciturn and serious to cheerful and almost childlike— much to his wife’s satisfaction. “He has been rejuvenated completely,” she told Muroi. Brain scans revealed that the stroke had blocked a single artery in the thalamus region of the brain. Sometimes strokes make people start to stutter, but this is the first time a stroke has been known to eradicate the problem. “The effect of the lesion seems to work both ways,” Muroi writes in Neurology (vol 53, p 890). After examining this case and reports of strokes that caused stuttering, Muroi suspects that a connection between the thalamus, deep in the brain, and the supplementary motor area at the back of the brain,