有时，你抑制不住，就是无法改变对某个人的换印象。那么，当你做出苛刻的初次（但通常持续很久）判断时，大脑里发生了什么呢？Peter Mende-Siedlecki 讲了第一印象的社会心理学原理，告诉我们为何这种印象表明人类大体上都很善良。一起来看看TED教育动画，学一学心理学~
Imagine you're at a football game when this obnoxious guy sits next to you.
He's loud, he spills his drink on you, and he makes fun of your team.
Days later, you're walking in the park when suddenly it starts to pour rain.
Who should show up at your side to offer you an umbrella?
The same guy from the football game.
Do you change your mind about him based on this second encounter,
or do you go with your first impression and write him off?
Research in social psychology suggests that we're quick to form lasting impressions of others based on their behaviors.
We manage to do this with little effort, inferring stable character traits from a single behavior,
like a harsh word or a clumsy step.
Using our impressions as guides, we can accurately predict how people are going to behave in the future.
Armed with the knowledge the guy from the football game was a jerk the first time you met him,
you might expect more of the same down the road.
If so, you might choose to avoid him the next time you see him.
That said, we can change our impressions in light of new information.
Behavioral researchers have identified consistent patterns that seem to guide this process of impression updating.
On one hand, learning very negative, highly immoral information about someone
typically has a stronger impact than learning very positive, highly moral information.
So, unfortunately for our new friend from the football game, his bad
behavior at the game might outweigh his good behavior at the park.
Research suggests that this bias occurs because immoral behaviors are more diagnostic,
or revealing, of a person's true character.
Okay, so by this logic, bad is always stronger than good when it comes to updating.
Well, not necessarily.
Certain types of learning don't seem to lead to this sort of negativity bias.
When learning about another person's abilities and competencies, for instance, this bias flips.
It's actually the positive information that gets weighted more heavily.
Let's go back to that football game.
If a player scores a goal, it ultimately has a stronger impact on your impression of their skills than if they miss the net.
The two sides of the updating story are ultimately quite consistent.
Overall, behaviors that are perceived as being less frequent are also the ones
that people tend to weigh more heavily when forming and updating impressions,
highly immoral actions and highly competent actions.
So, what's happening at the level of the brain when we're updating our impressions?
Using fMRI, or functional Magnetic Resonance Imaging, researchers have identified an extended network of brain regions
that respond to new information that's inconsistent with initial impressions.
These include areas typically associated with social cognition, attention, and cognitive control.