Some survivors of disastrous events have post-traumaticstress disorder (PTSD). Symptoms include nightmaresabout the experience and suddenly feeling as if the eventis recurring. Brain-imaging studies of people with PTSDshowed that their hippocampus was shrunken and theiramygdala unusually active. Given these changes, whatother brain functions might be disrupted in PTSD?

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A: We are giving ans for the first question .For other kindly repost

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Learning and memory

Learning is defined as a relatively permanent and irreversible adaptive change in behavior. It always results from experience. The ability of an organism to store and recall the effects, sensations, and knowledge gained through learning and experience is called memory.