Human brain is divided on fear and panic

New study contends different areas of brain responsible for external versus internal threats
Researchers at the University of Iowa say the human brain has a new, second gatekeeper that registers fear. The region, perhaps the brainstem, diencephalon or insular cortex, signals fear from internal dangers. The finding could lead to more precise treatment for people suffering from panic attacks and other anxiety disorders. Results appear in “Nature Neuroscience.”