"The reticular activating system (RAS) is an area of the brain (including the reticular formation and its connections) responsible for regulating arousal and sleep-wake transitions." From: http://en.wikipedia.org/wiki/Reticular_activating_system
The reticular formation is only few hundred cells deep in the brain stem. One can damage it (in cat or other animals) and they go into deep permanent sleep. As confirmed by the EEG patterns of deep sleep. They will never again eat or drink, so die unless intravenously feed. Then their body can live for months. They are not "brain dead."
I believe those rare cases of a human recovering after years of coma-like state (definitely never from vegetative state) is due to the the regenerative recovery of the reticular formation*
* BTW, another part of brain, in the thalamus as I recall, is also frequently called the "reticular formation."
The reticular formation is only few hundred cells deep in the brain stem. One can damage it (in cat or other animals) and they go into deep permanent sleep. As confirmed by the EEG patterns of deep sleep. They will never again eat or drink, so die unless intravenously feed. Then their body can live for months. They are not "brain dead."
I believe those rare cases of a human recovering after years of coma-like state (definitely never from vegetative state) is due to the the regenerative recovery of the reticular formation*
* BTW, another part of brain, in the thalamus as I recall, is also frequently called the "reticular formation."
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