Imagine that Smith and Jones have a terrible argument at work one day. Objectively, neither is in possession of the moral high ground and each gives and receives equal amounts of abuse and intolerance. Smith forgets about the incident as soon as she walks out of the door on her way home; after all, she is not the type of person to get angry about that sort of thing. In contrast, Jones is furious all the way home on the train and even when her anger has died down she is highly irritable for the rest of the evening. Why, in ostensibly the same circumstances, does Jones get angry while Smith does not? What psychological state is Jones in when she is no longer feeling angry but is in an irritable mood? Are there temperamental differences present at birth that may contribute to lifelong differences in emotionality?
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