It is thought that the forces from the injury disrupt the normal cellular activities in the reticular activating system located in these areas, and that this disruption produces the loss of consciousness often seen in concussion.
Endogenous noise levels fluctuate widely in the brain over the sleep-wake cycle and within its different phases, as well as with environmental demands, mostly determined by activity in the reticular activating system and the more specific arousal system mediated by the thalamus [64] [65].
Reduced electrical activity in the reticular activating system also appears to correlate with fatigue in laboratory animals [ 99- 101].
The reticular formation sends activation upward to the thalamus (which is why it is called the reticular activating system, which in turn distributes the activation to the rest of the cortex. The RF also governs the sleep-wake cycle.
This theory holds that the sense of danger and the physical extremes of a roller coaster ride prime a neural network at the base of the brain called the reticular activating system, which in turn heightens the level of activation throughout the rest of the brain.
This process involves the DMN (as defined by activity that correlates with the PCC), components of the reticular activating system, the thalamus, and parts of the cortex.
For example, exposure to cold can activate components of the reticular activating system such as raphe nuclei and locus ceruleus, which can result in activation of behavior and increased capacity of the CNS to recruit motoneurons.
Conscious awareness is found to be mediated by the ascending midbrain reticular activating system (a network of nerve cells in the brainstem).
The part of the brain that keeps us awake is known as the reticular activating system, or R.A.S., and is found on both sides of the brain.
The mesopontine cholinergic complex comprising the pedunculopontine (PPTg) and laterodorsal (LDTg) tegmental nuclei is a key component of ascending reticular activating system.
The search for a biological mechanism capable of altering the arousal level of an individual led to the discovery of a group of neurons (nerve cells) in the brain stem named the reticular activating system, or reticular formation.
