The phrase "associated with heightened activity" is correct and usable in written English.
You can use it when discussing a correlation or connection between something and an increase in activity levels, often in scientific or analytical contexts.
Example: "The study found that the medication was associated with heightened activity in the brain's reward centers."
Alternatives: "linked to increased activity" or "connected with elevated activity".
Previous studies have shown that postural orientations of the neck, such as flexed or forward head postures, are associated with heightened activity of the dorsal neck muscles.
These substructures are conditionally privileged, i.e. are associated with heightened activity only in the presence of other substructures.
Previous studies suggest that a dissociable neural network may be involved in the tasks requiring mere perceptual discrimination versus tasks requiring labeling, with the latter being associated with heightened activity in limbic-prefrontal systems [ 27].
Chronic alcohol abuse and acute alcohol withdrawal states are associated with heightened activity in the brain stress systems, such as increased secretion of the stress hormones corticotropin-releasing factor (CRF), norepinephrine, and cortisol in a number of the brain's stress and emotion centers, such as the hypothalamus, amygdala, hippocampus, and prefrontal regions (Koob and Kreek 2007).
The emergence of new norovirus variants (RR = 1.16; 95% CI: 1.10 to 1.22) and low population immunity were also associated with heightened norovirus activity.
Vagus nerve stimulation also decreases the incidence of ventricular arrhythmia associated with heightened sympathetic activity during myocardial infarction.
Polymorphisms related to lower serotonin transport and uptake (specifically, the 5- HTTLPR S-allele)—and therefore higher serotonin availability have been associated with heightened amygdala activity in response to emotional stimuli (see for meta-analyses Munafò et al. 2008; Murphy et al. 2013).
Stress has been defined as a 'nonspecific response of the body to any noxious stimulus' [ 1] and the stress response is associated with heightened sympathetic nervous activity and increased energy expenditure along with associated changes in heart rate, breath rate and blood pressure.
A meta-analysis demonstrated that the S variant was associated with heightened amygdala activation which would predispose S carriers to stress-related psychiatric disorders [ 46].
These processes are each naturally intrinsically associated with heightened pro-apoptotic pathway activity [ 22, 23].
Alcohol and marijuana are each associated with heightened risk of fatal crash involvement.
