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The Journal of Neuroscience, July 1, 1999, 19(13):5473-5481
Different Contributions of the Human Amygdala and Ventromedial
Prefrontal Cortex to Decision-Making
Antoine
Bechara 1, 2,
Hanna
Damasio 1, 3,
Antonio R.
Damasio 1, 3, and
Gregory P.
Lee 4
Departments of 1 Neurology and 2 Anatomy
and Cell Biology, University of Iowa College of Medicine, Iowa City,
Iowa 52242, 3 The Salk Institute of Biological Studies, La
Jolla, California 92186, and 4 Section of Neurosurgery,
Medical College of Georgia, Augusta, Georgia 30912
The somatic marker hypothesis proposes that decision-making is a
process that depends on emotion. Studies have shown that damage of the
ventromedial prefrontal (VMF) cortex precludes the ability to use
somatic (emotional) signals that are necessary for guiding decisions in
the advantageous direction. However, given the role of the amygdala in
emotional processing, we asked whether amygdala damage also
would interfere with decision-making. Furthermore, we asked whether
there might be a difference between the roles that the amygdala and VMF
cortex play in decision-making. To address these two questions, we
studied a group of patients with bilateral amygdala, but not VMF,
damage and a group of patients with bilateral VMF, but not amygdala,
damage. We used the "gambling task" to measure decision-making
performance and electrodermal activity (skin conductance responses,
SCR) as an index of somatic state activation. All
patients, those with amygdala damage as well as those with VMF damage,
were (1) impaired on the gambling task and (2) unable to develop
anticipatory SCRs while they pondered risky choices. However, VMF
patients were able to generate SCRs when they received a reward or a
punishment (play money), whereas amygdala patients failed to do so. In
a Pavlovian conditioning experiment the VMF patients acquired a
conditioned SCR to visual stimuli paired with an aversive loud sound,
whereas amygdala patients failed to do so. The results suggest that
amygdala damage is associated with impairment in decision-making and
that the roles played by the amygdala and VMF in decision-making are different.
Key words:
decision-making; conditioning; gambling task; skin
conductance; emotion; amygdala; prefrontal cortex
Copyright © 1999 Society for Neuroscience 0270-6474/99/19135473-09$05.00/0
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