§ 2741. Definitions. As used in this article:

1. "Traumatic brain injury" means an acquired injury to the brain
caused by an external physical force resulting in total or partial
disability or impairment and shall include but not be limited to damage
to the central nervous system from anoxic/hypoxic episodes or damage to
the central nervous system from allergic conditions, toxic substances
and other acute medical/clinical incidents. Such term shall include, but
not be limited to, open and closed brain injuries that may result in
mild, moderate or severe impairments in one or more areas, including
cognition, language, memory, attention, reasoning, abstract thinking,
judgment, problem-solving, sensory perceptual and motor abilities,
psycho-social behavior, physical functions, information processing and
speech. Such term shall not include progressive dementias and other
mentally impairing conditions, depression and psychiatric disorders in
which there is no known or obvious central nervous system damage,
neurological, metabolic and other medical conditions of chronic,
congenital or degenerative nature or brain injuries induced by birth
trauma.

2. "Concussion" means a mild traumatic injury to the brain that is
characterized by immediate and transient alteration of mental status and
level of consciousness, resulting from mechanical force or trauma.