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The researchers monitored signals in the striatum and prefrontal cortex , parts of the brain thought to be involved in how people evaluate rewards. They found that the brain activity in these areas was greater for the "rich" subjects when money was transferred to the other player than to themselves, whereas the "poor" subjects' brains showed the opposite pattern

n other words, everyone seemed to prefer a financial equality.

these regions were responding most when the outcome would be the most fair,