A two decades-long study discovered a method that slows dementia, according to a National Institutes of Health (NIH) announcement.

The study found that a rapid object detection task-based cognitive training lessened dementia diagnosis in adults over age 65 by 25%. More than 2,000 adults participated in the cognitive training for at least one hour two times a week for five-six weeks in 1999. Follow-ups were performed by 2019. “The interventions were designed to improve one of three kinds of cognitive function: memory, reasoning, and visual speed of processing,” NIH said.

Participants that experienced a slowed dementia diagnosis were given speed training plus “additional training at a later date.”