Finding Fear: Neuroscientists Locate Where It Is Stored In The Brain (Topix)
 

(Topix) Fear conditioning is a form of Pavlovian, or associative, learning and is considered to be a model system for understanding human phobias, post-traumatic stress disorder and other anxiety disorders.



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(From Topix Psychology)

And here I thought they have known it was in the Amygdala for decades. Site of fear & phobias -- fight or flight - primitive, and basic.