Researchers at Mass General Brigham have come up with the AI tool that analyses subtle changes in brain activity during sleep. The tool correctly flagged 85 per cent of individuals who eventually experienced cognitive decline, with an overall accuracy of 77 per cent. The researchers, however, added that larger studies with more diverse populations were required to validate and expand on these findings in diverse populations. According to the World Health Organization (WHO), about 55 million people worldwide live with dementia. The AI tool’s early detection system could be given valuable time to usher in radical lifestyle changes such as exercising, staying mentally active and eating a balanced diet. These changes may help preserve cognitive health before the effects of impairment set in, say the researchers. The study was published in the Journal of Alzheimer’s Disease, which is published by the University of Massachusetts, Boston, and is available online at: http://www.alzheimer’sdisease.org/news/features/alzheimers-diseases-and-dementia.html.