[ThinkBetter](https://thinkbetter.app/) → [Cognitive Biases](https://thinkbetter.app/cognitive-biases.md) → Bystander Effect

# Bystander Effect

We are less likely to help someone in need when other people are present.

![Bystander Effect illustration](https://assets.thinkbetter.app/images/bystander_effect.png)

The Bystander Effect is a social psychological phenomenon where individuals are less likely to offer help to a victim when other people are present. Essentially, it's like thinking, "Someone else will probably help, so I don't need to." We tend to assume that others will take responsibility in an emergency situation, leading to a diffusion of responsibility. This effect is stronger in larger groups, where the sense of individual responsibility becomes more diluted. Think of it like seeing someone fall on a busy street and assuming one of the many other passersby will surely stop to help!

## Example

**Medical Emergency**

You witness someone collapse in a crowded mall, but you don't offer help because you assume someone else will call for medical assistance. Why? The presence of many people diffuses the sense of personal responsibility.

## In your professional life

**Assign Specific Tasks**

When organizing team events or volunteer activities, assign specific tasks to individuals rather than asking for general volunteers. This could be as simple as saying "Alex, can you coordinate transportation?" instead of "We need someone to handle logistics." By giving people defined roles, you increase their sense of responsibility and reduce the chance of tasks being left undone, potentially leading to more successful and well-organized events.

## Go deeper in ThinkBetter

The ThinkBetter app has the full Bystander Effect deep-dive: more examples, a quiz to test yourself, audio narration, and a weekly path that builds these ideas into a habit.

- iOS: https://apps.apple.com/app/id6459831884
- Android: https://play.google.com/store/apps/details?id=io.ventureship.braintricks

### Related concepts

- [Zero-sum Thinking](https://thinkbetter.app/cognitive-biases/zero-sum-thinking.md)
- [All mental models](https://thinkbetter.app/mental-models.md)

Page: https://thinkbetter.app/cognitive-biases/bystander-effect