The recovering stroke patient's reduced fear and anger responses, and his difficulty understanding emotional expressions, likely reflect damage to the amygdala.
An amygdala represents the integrative center for emotions, emotional behavior, and motivation. When the brain is turned upside down the end of the structure continuous with the hippocampus, this is called the uncus but when we peel away uncus, we will expose the amygdala which abuts the anterior of the hippocampus.
We have an amygdala hijack as an emotional response that is immediate and overwhelming with the actual stimulus because it has triggered a much more significant emotional threat.
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