Context: Human relationships
On a crowded train, a passenger sees a stranger trip, fall to the floor and cry out in pain. The passenger winces, feels distressed, and immediately feels a strong urge to go and help, even though they have never met the stranger. Later, the passenger reads that brain-imaging research has found that some of the brain regions that are active when we feel pain ourselves are also active when we watch someone else in pain.
With reference to this scenario, how localization of function may help to account for the passenger's urge to help.