The phrase "a mental activity" is correct and usable in written English.
It can be used to refer to any process or task that involves cognitive functions, such as thinking, reasoning, or problem-solving.
Example: "Meditation is often considered a beneficial mental activity that promotes relaxation and mindfulness."
Alternatives: "a cognitive process" or "a thought process".
Driving is above all a mental activity.
It's not merely a mental activity.
However, even with clinical grade EEG sets it is difficult to avoid recording muscle movements (when concentrating on a mental activity, people tend to furrow their brows and make involuntarily facial movements – see box).
As summarized by [4], prayer can be understood as a mental activity and a form of communication with God.
Yet we often have very little to say about how information, or how a mental activity, is distributed over 1 h or more.
The subjects involved in the experimentation were either playing a game or involved in a mental activity and each of these activities induce a perceptible concentration level in the participants which the application records.
The elevated activity in the frontal region may reflect extra visual processing--a mental activity that isn't the same thing as what we think of as intelligence, he says.
But that such a complex mental activity as reading a comic story should cause a specific reflex contraction of the facial muscles is a phenomenon that has puzzled philosophers since Plato.
Dream is a universal mental activity present during sleep, characterized by hallucinatory production.
Despite the fact that further experimental verification is required in order to validate our claim, different assemblies of firing neurons might have the appearance of diverse codes, each one responsible for a single mental activity.
Active neuronal networks in some specific conditions - (with symmetric reciprocal interactions) give rise to a convergent mental activity involving multiple attractors [9], [10].
