Famous Psychology & Social Experiments
Why do people give when they expect nothing back? Psychologists and sociologists have tested that question for decades. This guide walks through the most famous experiments that explain generosity, altruism, and the surprising ways strangers behave toward one another.
The Dictator Game
In the Dictator Game, one person is given a sum of money and can split it with another person however they like. The receiver has no power to reject the offer, so a purely selfish player would keep everything. Yet many people still give something away — often around 20–30%.
The experiment shows that fairness and generosity are not rare exceptions; they are built into how many people make choices, even when no one is watching.
The Ultimatum Game
The Ultimatum Game adds a twist. The first player proposes a split, and the second player can accept it or reject it. If the second player rejects, both get nothing. Low offers are often rejected, which means people will punish unfairness even at a cost to themselves.
This study reveals that reciprocity and social expectations matter. People do not only care about money; they care about whether others are playing fair.
The Bystander Effect
After the 1964 Kitty Genovese case, psychologists Bibb Latané and John Darley studied what became known as the Bystander Effect. They found that people are less likely to help someone in need when others are present, because responsibility feels diffused.
The flip side is important: when people feel personally addressed, or when a situation is clear, they are often surprisingly willing to step in.
The Good Samaritan Study
Darley and Batson’s Good Samaritan Study tested seminary students on their way to give a lecture. Some were told they were running late; others had plenty of time. Students in a hurry were far less likely to stop and help a person slumped in a doorway.
The lesson is that circumstance and attention shape generosity as much as character does. Make giving easy and visible, and more people will do it.
What These Experiments Teach Us
Across these studies, a few patterns appear:
- People often give more than pure self-interest predicts.
- Fairness matters, and unfairness is punished.
- Responsibility and attention strongly influence whether someone helps.
- Context — urgency, clarity, and social cues — shapes behavior.
Give Anyway: A Modern Experiment
Give Anyway is a living, real-world version of the same questions. There is no charity, no cause, and no reward. Visitors can send money to a stranger simply because they choose to.
Like the Dictator Game, it tests whether people share when they do not have to. Like the Good Samaritan Study, it depends on whether visitors notice and feel invited to act. And like every social experiment before it, the wall of entries becomes a record of what strangers do when no one is forcing them to be kind.