AI Tutor
Imagine you and your friends all mildly like a new video game. After chatting in a group call for an hour, you hang up convinced it is the undisputed game of the decade.
When people who already lean in the same direction talk things over, they rarely stay moderate — they push each other toward an extreme.
How did psychologists first stumble onto this strange quirk of human decision-making?

The Risky Shift Phenomenon

In 1961, graduate student James Stoner tested whether groups make more cautious decisions than individuals when facing hypothetical life choices.
Common wisdom assumed a committee would play it safe, but Stoner discovered the exact opposite: groups chose significantly bolder options, an outcome dubbed the risky shift.
A primary driver behind this effect is the diffusion of responsibility, where accountability for negative fallout is shared across the entire group.
In collective settings, each member's personal exposure shrinks: Perceived Individual Risk=Total RiskN\text{Perceived Individual Risk} = \frac{\text{Total Risk}}{N} where NN is the total number of participants.
Because accountability is divided, psychological barriers against failure drop, leaving individuals far more willing to endorse high-risk actions.
Does this mean every group discussion always produces dangerous, daredevil choices?

From Risky Shift to Group Polarization

In 1969, French researchers Serge Moscovici and Marisa Zavalloni showed that groups do not always favor risk; they simply amplify whatever viewpoint was already favored.