Oddly Wired
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social dynamics

You help less when others are present.

A 1968 study found that participants were significantly slower to report a plume of smoke filling a room if they were in a group compared to when they were alone.

This is the diffusion of responsibility. In a group, you assume someone else will act or that the lack of others' panic means there is no actual danger, paralyzing your own response.

The presence of others is not a comfort, but a barrier to acting.

Where this comes from

Study
Latané and Darley, 1968, Journal of Personality and Social Psychology
What the check found
This refers to the classic Darley and Latané study. The finding is well-established in social psychology, though the underlying mechanism is often debated by academics.
Confidence
Well replicated
social dynamicsbystander effectprosocial behavior

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.