08/03/2023
Here's the kicker: FALSE "odorants" (not essential oils) did not improve the volunteers' memory, verbal learning, planning, and attention-switching skills.
"The olfactory sense has the special privilege of being directly connected to the brain's memory circuits," says neurobiologist Michael Yassa.
Yassa and his colleagues provided 20 of the study's recruits with an assortment of natural oils containing fragrances of rose, orange, eucalyptus, lemon, peppermint, rosemary, and lavender.
The rest of the group were provided with a 'sham' that contained trace amounts of an odorant. All of the participants were required to use one of the oils with a diffuser to perfume their home for two hours every night over a six-month period, rotating through their menu of fragrances.
A battery of neuropsychological tests was then used to compare the volunteers' memory, verbal learning, planning, and attention-switching skills before and after the six-month trial.
Astonishingly, there was a clear 226 percent difference between the responses provided by those who were exposed to a variety of fragrances and individuals in the control group.
Of all the senses we love to indulge, scent is often neglected – but the right smells could be just what your brain needs to keep it whirring in old age. Researchers at the University of California, Irvine recently uncovered strong evidence that enriching the air with fragrances improves cognitive...