Fig. 2.

People who are more certain about an initial judgment are less likely to change their minds upon being presented with new sensory evidence or social advice. A decider receives a first sample of sensory evidence on a random-dot motion task (first judgment) and is then presented with either new sensory evidence (a) or social advice (b). Based on this new evidence, the decider makes a second judgment. Confidence in the first judgment affects how likely the decider is to take on board the new evidence (integrating the new sensory evidence or following the advice). More (versus less) confident decisions are less (versus more) likely to be updated when new sensory or social evidence becomes available.