Justin S. Feinstein studied fear and bodily signals in people with bilateral amygdala damage. A carbon-dioxide inhalation challenge investigated panic responses through a route different from viewing an external threat. Comparing these responses shows why a brain structure’s contribution must be specified for the stimulus and outcome being measured rather than summarized as the single location of all fear. [ref]
Fear and panic in humans with bilateral amygdala damage by Justin S. Feinstein and others. 2013, inhalation challenge and subjective panic responses
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