The negativity bias concerns the way you appraise events beyond your control. "When you're presented with negative information, that tends to stick in your mind," says Saleska. The optimism bias, in contrast, concerns your beliefs about yourself – whether you think you are fitter and healthier than the average person. These biases may work independently, meaning that you may focus on the dangerous side effects of the vaccines while simultaneously believing that you are less likely to suffer from the disease, a combination that would reduce confidence and increase complacency.

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