Significant results. Overnight olfactory enrichment using an odorant diffuser improves memory and modifies the uncinate fasciculus in older adults.
https://www.frontiersin.org/articles/10.3389/fnins.2023.1200448/full
Upd: Do your own research before trying anything.
This is mainly due to stimulation of the olfactory nerve which is located in the hook bundle area and accordingly stimulation of the sense of smell causes an improvement in the functioning of the left hook bundle
Upd: essential oils are very dangerous for cats and other pets.