The phrase "are more active when" is correct and usable in written English.
It can be used to describe a condition or situation in which a subject exhibits increased activity or engagement.
Example: "Animals are more active when the sun rises, as they begin their search for food."
Alternatives: "tend to be more active during" or "show increased activity when".
Volatiles in wine are more active when wine is warmer.
Climate change may also mean that the adelgids are more active when birds fly south.
Letting our minds wander may also increase communication between the brain's default mode network the parts of our brain that are more active when we're at rest and its executive areas, which are used in so-called higher reasoning and decision-making functions.
Letting our minds wander may also increase communication between the brain's default mode network — the parts of our brain that are more active when we're at rest — and its executive areas, which are used in so-called higher reasoning and decision-making functions.
Researchers at Emory University and Baylor College of Medicine discovered that the pleasure centers of our brains are more active when we experience surprising positive moments, as compared to positive moments that are expected to unfold.
The primary experimental data on which his argument is based is the fact that portions of the brain independently implicated in emotional reaction are more active when subjects consider cases giving rise to characteristically deontological intuitions than when they consider cases giving rise to characteristically consequentialist intuitions.
It is possible that sequence elements controlling recombination hotspot activity may be more active when embedded in repetitive elements as is the case in humans [46], [53].
Another part is more active when they anticipate losing money or avoiding a risk.
While they performed this task, the amygdala of all volunteers was more active when the face was African American.
In addition, some of these areas were more active when subjects performed a verbal working memory task, and others were more active when subjects performed a visuo-spatial task.
Alternatively, ice volcanoes — which may have been more active when the planet was younger and warmer — could have spewed out roiling water that resurfaced the globe.
