Oddly Wired
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social dynamics

Groups make riskier decisions than individuals alone.

Group polarization describes the finding that group discussion often leads members to advocate for more extreme positions than they held individually; risky shift is a specific subset of this phenomenon where the extreme position is specifically the riskier one.

Change 'Risky shift' to 'Group polarization' to accurately reflect the definition provided.

Your caution often evaporates when you are in a room with others.

Where this comes from

Study
Stoner, 1961, A Comparison of Individual and Group Decisions
What the check found
The claim defines risky shift using the definition for group polarization. While Stoner (1961) identified the risky shift, it is a subset of the broader group polarization effect, not the entire concept.
Confidence
Solid, with limits

Related

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