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How the brain handles surprise, good and bad
Date:9/19/2007

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The researchers analyses of the activity of the amygdala neurons did reveal different types of neurons. Some neurons responded to either the reward or the aversive stimulus, but not both. However, the activity of distinctly different sets of neurons was affected by expectation of either a reward or an aversive experience.

These different neuronal populations may subserve two sorts of processes mediated by the amygdala: those activated by surprising reinforcements of both valencessuch as enhanced arousal and attentionand those that are valence-specific, such as fear or reward-seeking behavior, wrote the researchers.

They concluded that These different types of response properties may underlie the role of the amygdala in multiple processes related to emotion, including reinforcement learning, attention, and arousal. Future work must develop experimental approaches for unraveling the complex anatomical circuitry and mechanisms by which amygdala neurons influence learning and the many emotional processes related to the valence and intensity of reinforcing stimuli.


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Contact: Nancy Wampler
nwampler@cell.com
617-386-2121
Cell Press
Source:Eurekalert

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