The results were released in the journal Neurology.
The findings can be read in JAMA.
The subjects were provided questionnaires to gather more information about their leisure activities.
The study was led by experts at MIT.
New research by two authors at the University of Nevada, Las Vegas has refuted a popular theory.
The findings were published in Autism Research.
The report involved the reviewing of over 70 studies exploring a potential link between cognitive decline and air pollution.
The study was conducted at Tufts University and the University of Oxford.
Researchers focused on a bioactive compound known as pelargonidin.
The longitudinal study is one of the first studies of its kind focusing on olfaction.
The findings appeared in the journal Cell Stem Cell.