[Mark in Idaho]

The following article puts research data to some of the points I have made about concussion and adds more useful information.

Beware, it is even longer than my long posts (Can that even happen?)

http://www.brainline.org/content/201...gn=BrainLineSM

There are some inconsistencies and errors such as those in larger font size
<Concussion symptoms can include immediate memory disturbance, confusion, clumsiness, dizziness, and vomiting. The majority of children will make a complete recovery from a single concussion but it is important to remember that recovery can take days, weeks, and even months and that a number of cognitive and physical symptoms are possible. These post-concussive neurobehavioral symptoms are typically divided into three domains — somatic [physical], cognitive, and emotional/behavioral — and can include any combination of symptoms.

Like other TBIs, a concussion involves rotational acceleration/deceleration forces to the brain that can stress and tear axons and the vasculature, causing diffuse injury, cell death, and intracranial bleeding. In addition to understanding these biomechanical forces, considerable progress has been made in understanding the brain's chemical response to concussion through animal models. Whereas the healthy brain is constantly working to achieve chemical equilibrium, concussion can cause a "cascade" of significant metabolic disturbances in the brain including decreased cerebral blood flow, increased production of glucose and glutamate, and abnormal cellular ionic fluxes that can take minutes, hours, or days to return to equilibrium (Giza & Hovda, 2001).>

Many concussions have no rotational force at all, Just a quick deceleration/ stop or acceleration.

An important comment is the statement about the danger of concussion on a young maturing brain. It can overshadow any plasticity the younger brain may have. This interruption of an age specific phase of brain maturation is usually not recoverable.