The hearing acuity of dogs is superior by far to that of humans.
Scientists do not have all the answers, but studies of older people who have maintained their mental acuity provide some clues.
The study confirms some long-standing folklore about the acuity of one of North America's most familiar birds — and offers new insight into how some wild animals may cope with living alongside people.
That those who believe in an afterlife ascribe mental acuity to the dead is hardly surprising.
At those moments, our bodies actually take over and increase blood flow so that we have greater visual acuity, increased mental capacity and more oxygen and fuel for our muscles to use.
And the professor who enrolled me on the course was quick to add that I would need to have a "certain kind of personality or mental acuity" to survive this "masculinised" discipline.
So much energy is spent trying to suppress the strong emotions that your sensory acuity is diminished — you are paying less quality attention to what is actually happening.
It is this acuity, acquired by trial and error over millions of years of coevolution with their hosts, that researchers are tapping to design novel therapies.
Patients whose visual acuity (VA) before surgery was< 6/60 in the better eye comprised 47% of the total case mix in poorly developed countries and 1% in developed countries (P < 0. 001).
Dr Clinton Wright, professor of neurology at Columbia University, New York, found that moderate drinkers score higher in mental acuity tests than those who never touch alcohol.