https://www.wired.co.uk/article/optimism-bias

Using functional magnetic resonance imaging (fMRI), Sharot identified that a region of the brain called the inferior frontal gyrus (IFG) -- a frontal lobe with both left and right divisions -- was crucial to a person's ability to update their beliefs with new information. Participants in the 2007 study appeared to have a high optimism bias originating from the right IFG, and were worse at modifying their beliefs in the face of undesirable information.

- hm ...

The UCL team are yet to speculate on the commercial aspects of such an application. Wired.co.uk is reminded of the Penfield mood organ of Philip K Dick's novel Do androids dream of electric sheep?, an electronic device that could stimulate different emotions in users by simply dialling in a number. Creating or removing an optimism bias could have interesting consequences for people taking on various activities, from assessing stock market moves to deciding on whether to go white water rafting.

- not yet ....