A recent study conducted at the University of California, Irvine shows evidence that air with fragrances improves cognitive performance by strengthening a connection between memory and decision-making, according to Science Alert.
Forty-three men and women aged 60 to 85 participated in the experiment.
Twenty of the participants were provided with an assortment of natural oils containing fragrances of rose, orange, eucalyptus, lemon, peppermint, rosemary and lavender. The remainder of the candidates were given an oil with trace amounts of odorant.
They then used the oils with a diffuser in their home for two hours every night over a six month period.
There was reportedly a 226% difference between the responses of each test group.
Findings suggested cognitive decline might be slowed by diffusing a different choice of perfumes in a bedroom before going to sleep.