Optimistic belief updating despite inclusion of positive events

- Including positive life events in the belief update task did not result in pessimistic belief updating.
- Overall, a pattern of optimistic belief updating was observed.
- Participants exhibited optimistic belief updating for negative but not positive events.

A recent methodology - namely, the belief update task - used in the study of unrealistic optimism has provided a mechanistic account of how people maintain positive illusions about their future in the face of disconfirming evidence. This methodology has been used in a series of neuroscientific studies and neural moderators of unrealistic optimism have been established. A subsequent critique of the belief update task by Shah et al. (2016) has cast doubt over the validity of these findings however, with the authors instead suggesting that apparent optimistic belief updating is in fact a statistical artefact resulting from a flawed methodology. Specifically, Shah et al. assert that the inclusion of positive events in the belief update task can help test the validity of the optimistic account of belief updating, while proponents have suggested that caution should be taken when adapting this task to study positive life events because there is a lack of accurate information regarding the likely frequency of such events. Using a subset of the life events used by Shah et al., the current paper demonstrates that optimistic belief updating should still be observed when positive life events are included in the belief update task.