Oddly Wired
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social behavior

The presence of others changes your moral compass.

The bystander effect demonstrates that your likelihood of intervening in an emergency decreases as the number of witnesses increases.

In a 1968 experiment, participants were significantly slower to seek help when they believed others were also watching the event. Diffusion of responsibility makes inaction feel like a shared, and therefore acceptable, decision.

The larger the crowd, the more invisible your responsibility.

Where this comes from

Study
Latane and Darley, 1968
What the check found
The 1968 study is the foundational source for this effect. While the effect size and generalization have been debated, the core claim accurately reflects the findings of Latané and Darley.
Confidence
Well replicated

Related

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