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Imagine you're at a football game

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when this obnoxious guy sits next to you.

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He's loud,

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he spills his drink on you,

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and he makes fun of your team.

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Days later, you're walking in the park

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when suddenly it starts to pour rain.

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Who should show up at your side

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to offer you an umbrella?

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The same guy from the football game.

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Do you change your mind about him

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based on his second encounter,

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or do you go with your first impression

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and write him off?

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Research in social psychology suggests

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we're quick to form lasting impressions of others

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based on their behaviors.

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We manage to do this with little effort,

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inferring stable character traits

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from a single behavior,

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like a harsh word

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or a clumsy step.

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Using our impressions as guides,

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we can accurately predict

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how people are going to behave in the future.

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Armed with the knowledge

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that the guy from the football game

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was a jerk the first time you met him,

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you might expect more of the same down the road.

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If so, you might choose to avoid him

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the next time you see him.

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That said, we can change our impressions

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in light of new information.

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Behavioral researchers have identified

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consistent patterns that seem to guide

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this process of impression updating.

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On one hand, learning very negative,

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highly immoral information about someone

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typically has a stronger impact

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than learning very positive, highly moral information.

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So, unfortunately for our new friend

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from the football game,

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his bad behavior at the game might outweigh

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his good behavior at the park.

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Research suggests that this bias occurs

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because immoral behaviors are more diagnostic,

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or revealing,

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of a person's true character.

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Okay, so by this logic,

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bad is always stronger than good

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when it comes to updating.

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Well, not necessarily.

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Certain types of learning don't seem to lead

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toward sort of negativity bias.

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When learning about another person's abilities and competencies,

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for instance,

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this bias flips.

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It's actually the positive information

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that get weighted more heavily.

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Let's go back to that football game.

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If a player scores a goal,

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it ultimately has a stronger impact

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on your impression of their skills

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than if they miss the net.

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The two sides of the updating story

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are ultimately quite consistent.

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Overall, behaviors that are perceived

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as being less frequent are also the ones

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that people tend to weigh more heavily

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when forming and updating impressions,

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highly immoral actions

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and highly competent actions.

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So, what's happening at the level of the brain

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when we're updating our impressions?

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Using fMRI,

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or functional Magnetic Resonance Imaging,

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researchers have identified

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an extended network of brain regions

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that respond to new information

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that's inconsistent with initial impressions.

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These include areas typically associated

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with social cognition,

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attention,

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and cognitive control.

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Moreover, when updating impressions

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based on people's behaviors,

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activity in the ventrolateral prefrontal cortex

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and the superior temporal sulcus

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correlates with perceptions

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of how frequently those behaviors occur in daily life.

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In other words, the brain seems to be tracking

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low-level, statistical properties of behavior

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in order to make complex decisions

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regarding other people's character.

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It needs to decide

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is this person's behavior typical

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or is it out of the ordinary.

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In the situation

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with the obnoxious-football-fan-turned-good-samaritan,

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your brain says,

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"Well, in my experience,

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pretty much anyone would lend someone their umbrella,

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but the way this guy acted at the football game,

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that was unusual."

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And so, you decide to go with your first impression.

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There's a good moral in this data:

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your brain, and by extension you,

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might care more about

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the very negative, immoral things

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another person has done

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compared to the very positive, moral things,

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but it's a direct result

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of the comparative rarity of those bad behaviors.

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We're more used to people being basically good,

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like taking time to help a stranger in need.

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In this context, bad might be stronger than good,

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but only because good is more plentiful.

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Think about the last time you judged someone

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based on their behavior,

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especially a time when you really feel

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like you changed your mind about someone.

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Was the behavior that caused you

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to update your impression

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something you'd expect anyone to do,

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or was it something totally out of the ordinary?