Introduction to Crowd and Collective Behaviour

Have you ever noticed that people seem to act differently when they are in a large group compared to when they are on their own? Whether it is a crowd cheering at a football match or a group of people helping out after an accident, being part of a "collective" changes how we think and act. In this chapter, we explore how being in a crowd influences our choices and whether that leads to helpful or harmful actions.

What is Collective Behaviour?

Collective behaviour refers to the way people act when they are part of a larger group or "collective." This kind of behaviour is often different from how the individuals would act if they were alone.

Psychologists are interested in why our individual personality sometimes seems to "disappear" when we join a crowd. This links back to the concept of deindividuation, which you may have seen in the key terms section. When we are in a crowd, we often feel anonymous (like no one knows who we are), which can make us feel less responsible for our own actions.

Individual vs. Crowd Behaviour

  • Individual behaviour: Usually guided by our own personal morals, values, and the fear of being judged by others.
  • Crowd behaviour: Often guided by the "mood" or "energy" of the group. We might follow what everyone else is doing, even if it goes against our usual rules.

Pro-social and Anti-social Behaviour

Collective behaviour isn't always "bad." It can lead to two very different types of actions: pro-social and anti-social.

1. Pro-social Behaviour

Pro-social behaviour is any action that is intended to help or benefit other people or society as a whole. In a crowd, this can be very powerful because many people are working together for a good cause.

Example: Think of a peaceful protest where thousands of people march for a common cause, or a crowd at a music festival that works together to help someone who has fallen over. This is collective behaviour that is positive and helpful.

2. Anti-social Behaviour

Anti-social behaviour is action that is harmful to others, disruptive, or shows a lack of consideration for the well-being of others. When people are in a crowd and feel they cannot be identified, they may engage in behaviours they would usually find shocking.

Example: Rioting or looting are classic examples of anti-social collective behaviour. People might smash windows or take things because they see others doing it and feel that, as part of a large crowd, they won't get caught.

Quick Tip: A good way to remember the difference is that "Pro" means "for" (for society) and "Anti" means "against" (against society).

The Effect of the Crowd on the Individual

Why does the crowd have such a big effect on us? There are a few reasons why collective behaviour happens:

  • Loss of Responsibility: In a crowd, the responsibility for an action is "spread out" among everyone. An individual might think, "It wasn't just me; everyone else was doing it too."
  • Sense of Anonymity: If you feel like just a "face in the crowd," you might feel that your usual social "mask" is gone. This makes you more likely to follow the group's lead, whether it is pro-social or anti-social.
  • Group Norms: Crowds develop their own "rules" or "norms" very quickly. If the crowd is acting kindly, you are likely to act kindly. If the crowd becomes aggressive, you may feel pressure to act aggressively to fit in.

Real-World Connections

Understanding crowd behaviour is very important for people like event organisers and the police. For example, at a large concert, organisers try to encourage pro-social behaviour by having clear exits, plenty of water, and friendly staff. This helps keep the "mood" of the crowd positive and prevents anti-social behaviour from starting.

Did you know? Not all crowds are "mindless." Research shows that even in emergencies, crowds often show great pro-social behaviour, with strangers helping each other to safety!

Common Mistakes to Avoid

Mistake 1: Thinking all crowds are "bad." Many students assume collective behaviour always means rioting. Remember to mention pro-social examples like charity events or peaceful marches to get top marks!

Mistake 2: Confusing deindividuation with the bystander effect. While they are related, deindividuation is about losing your identity in a crowd, whereas the bystander effect is specifically about failing to help someone because you think others will do it. (You can read more about this in the "Factors affecting bystander intervention" chapter).

Key Takeaways

Key Point 1: Collective behaviour is how we act in a group, and it is often different from how we act alone.

Key Point 2: Being in a crowd can lead to pro-social (helpful) or anti-social (harmful) behaviour.

Key Point 3: Crowds make us feel anonymous and reduce our sense of personal responsibility, which is why we "go along" with the group's actions.


Note: For more details on the specific studies related to this topic, see the notes on Piliavin et al. (1969) and Haney, Banks and Zimbardo (1973).