A condition in which the person utters no words and does not follow commands or make any response that is psychologically meaningful. The transition of a person who remains unconscious from a scare of “coma” to one of “vegetative behaviors” reflects subtle changes over a period of several months from a condition of no response to the internal or external environment (except reflexively) to a state of wakefulness but with no indication of awareness (cortical function). A person in this state may have a range of biological responses at the subcortical level such as eye opening (with sleep and wake rhythms) and sometimes the ability to follow with their eyes. Normal levels of blood pressure and respiration (vegetative functions) are maintained automatically. Also called Coma Vigil.