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In the next stage, the scientists asked the participants some questions about type and frequency of their altruistic or helping behaviours.
They then analysed the responses to generate an estimate of a person's tendency to act altruistically and compared each person's level of altruism against their fMRI brain scan.
The results showed that pSTC activity rose in proportion to a person's self-reported level of altruism.
According to the researchers, the results suggest that altruistic behavior may originate from how people view the world rather than how they act in it.
" We believe that the ability to perceive other people's actions as meaningful is critical for altruism ", said lead study investigator Dharol Tankersley.

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