Psy 123_Lec 13 Emotion

The amygdalas role in emotion was discovered early on

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Unformatted text preview: s! hypersexuality! 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) -hypersexuality 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 response.! 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 the thalamus.! A rough approximation of the stimulus is transmitted to the amygdala, which can begin an...
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