One type of this action was first proposed by W.D. Hamilton and received its name of "greenbeard effect" after an example in The Selfish Gene.  
Jorge Moll and Jordan Grafman showed a neurological link to this phenomenon via fMRI, showing that engaging in this action leads to stimulation of the subgenual cortex.  One type of this action was first proposed by W.D. Hamilton and received its name of "greenbeard effect" after an example in The Selfish Gene.  The frequency of this action is governed by Hamilton's rule, and it explains why ground squirrels subject themselves to potential harm to warn others of predators.  FTP, name this behavior wherein one acts to favor the reproductive success of others.
Jorge Moll and Jordan Grafman showed a neurological link to this phenomenon via fMRI, showing that engaging in this action leads to stimulation of the subgenual cortex.  
{altruistic} behavior (accept word forms like {altruism}; prompt on less precisely correct terms like self-sacrifice)