Mental sharpness in women begins to decline in their 50s, earlier than previously thought, according to a new UCLA study released Friday.
The study, which followed the same group of healthy women for 10 years after menopause, found that their average decline in mental processing ability was 5 percent during the decade-long period.
Cognitive processing speed, which includes speed of perception and reaction, showed an average decline of around 1 percent every two years and verbal memory declined on average around 1 percent every five years, according to research published in the journal PLOS ONE.
Previous longitudinal studies in midlife women had failed to consistently detect these cognitive declines.
For the study, researchers accounted for what are called “practice effects,” which is when repeat testing using the same tests in the same individuals influence the results. Practice effects mask some effects of the menopause transition.
In this way scientists were able to uncover evidence of declines in two domains of cognitive functioning — processing speed and verbal memory.
The researchers examined data on more than 2,000 healthy women enrolled in the Study of Women’s Health Across the Nation who were tested regularly over several years to measure cognitive changes.
The women were in their 40s when they enrolled in 1996 and were followed every one to two years for a median period of 6.5 years.
— City News Service