Oddly Wired
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social dynamics

The presence of others decreases your urgency to help.

The bystander effect reduces the probability of any single individual offering assistance in an emergency when others are present.

Responsibility is diffused across a crowd, leading individuals to wait for someone else to act first. In a 1968 experiment, students were less likely to help a peer having a seizure if they believed others were also listening.

Social silence is not indifference, but a shared mistake.

Where this comes from

Study
Bibb Latané, 1968
What the check found
The claim refers to the foundational Latané and Darley (1968) experiment. While the provided text does not contain the specific experimental details, the finding is widely accepted as a classic social psychology phenomenon.
Confidence
Solid, with limits
social-dynamicshuman-behaviorresponsibility

Related

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