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The Amygdala's role in emotion was discovered early on though work with
animals. When they removed large portions of the MTL that include the
amygdala, found a couple typical symptoms.
- ﬂattening of emotions (were not as fearful)
-failure to recognize common objects
-extreme orgal tendencies (wanted to put their mouth on everything)
In humans, lose hypersexuality/oral tendencies. But in patients like H.M., they
lose the ability to recognize objects. And if amygdala is included, will have
ﬂattening of emotions Looked at ﬂattening of emotions through fear conditioning. Fear Conditioning! Rat hears the sound which When the sound is paired
produces no physiological with electric shock, the rat’s
blood pressure increases and
the rat stops moving.! After repeated pairings, the
sound alone now produces
the same physiological
response.! A couple things could occur, it cesses movement when it is shocked or scared, or its blood pressure increases. When no stimulus is paired w/ sound, there is no
physiological response. When it is paired, see increases in blood pressure and stops moving. Eventually if paired enough, the sound alone will produce the
physiological respponse. What happens if you block the functioning of the amygdala?
They found in that case, it will no longer produce that physiological response. What ever fear conditioning it learned is now lost b/c the amygdala is still there. The circuitry to the
amygdala is very primitive, so it has been shown that animal studies are more applicable then other areas of the brain. Response after blocking the amygdala! The rat learns the conditioned fear response.!
The amygdala is kept from responding by either
lesioning it or by chemically blocking it.!
Now, without the amygdala, when the rat hears the sound!
it no longer produces a physiological response.! No physiological
response! Pathways involved in a fearful response in humans!
Visual stimulus is processed via
A rough approximation of the
stimulus is transmitted to the
amygdala, which can begin an...
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- Fall '11