Which of the following is NOT a characteristic of hypervigilance?

Hypervigilance is a state of heightened alertness and awareness that often occurs in response to a perceived threat or stressor. In this state, individuals may experience several physiological and psychological changes.

Increased peripheral vision is a characteristic of hypervigilance, as individuals in this state are more aware of their surroundings and can detect movement or threats in their peripheral field. Elevated blood pressure is also commonly associated with hypervigilance, as the body reacts to stress with a "fight or flight" response, which can increase heart rate and blood pressure. More focused hearing is another characteristic, as those experiencing hypervigilance tend to pay closer attention to sounds that may indicate danger.

The presence of a decreased heart rate is not characteristic of hypervigilance. In fact, during hypervigilance, the heart rate typically increases due to adrenaline and the body's stress response. A decreased heart rate would suggest a state of relaxation, which is contrary to the heightened state of awareness and alertness that defines hypervigilance. Therefore, this characteristic is correctly identified as not belonging to hypervigilance.