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Psychologists have shed light on why seemingly intelligent people ignore the evidence base supporting vaccines and label them unsafe, despite having little to no expertise on scientific methodology.

They believe anti-vaxxers may be falling prey to a cognitive bias known as the Dunning Kruger effect, in which people overestimate their knowledge about a subject and underestimate how much they don鈥檛 know.

Cognitive biases are a natural human tendency resulting from the mental shortcuts (鈥榟euristics鈥�) we use subconsciously to process information and fill in blind spots in our knowledge.

The Dunning鈥揔ruger effect 鈥� often referred to as 鈥榠gnorance of one鈥檚 own ignorance鈥� 鈥� is a well-documented bias that has been known to psychologists since 1999.

David Dunning, psychology professor at the University of Michigan 鈥� who coined the term 鈥� said the effect is harmful, because people are often oblivious to its impact on their own thinking.

鈥淭he first rule of the Dunning鈥揔ruger club is you don鈥檛 know you鈥檙e a member of the Dunning鈥揔ruger club,鈥� he said in a .

Indeed, researchers from the University of Pennsylvania, Utah Valley University and Texas A&M University recently led a into the psychology of anti-vaxxers. They found evidence that the Dunning鈥揔ruger effect plays a key role in widely held beliefs about vaccinations 鈥� specifically the false claim that MMR jabs cause autism.

Testing 1300 people, they found that 62% of those that performed the worst on autism knowledge tests rated themselves as knowing 鈥榓s much鈥� or 鈥榤ore鈥� than doctors about the causes of autism.

Professor Matthew Hornsey of the University of Queensland 鈥� well known for his research on anti-vaxxers 鈥� said that conspiracy theories are also to blame.

鈥淪ome people think it is commonplace for groups of powerful elites to band together and conduct elaborate hoaxes on the public. Vaccinating the public involves cooperation between government and Big Pharma, two institutions that people find notoriously hard to trust. With that mistrust comes the conspiracy theories. People join the dots and presume a sinister motive,鈥� he said.

However, conspirational thinking has also been linked to illogical reasoning and cognitive bias 鈥� namely, the 鈥榗onjunction fallacy鈥�.

The conjunction fallacy is where people rate a specific outcome (eg, it will rain tomorrow) as more probable than a general outcome (eg, it will be bad weather tomorrow) 鈥� even though the broadness of the second statement makes it more likely.

Indeed, researchers at the University of London found that those who believed conspiracy theories were .

The solution, researchers say, is to summon social influencers to promote vaccines. show that people who think they know more than medical experts about medical conditions are more likely to trust non-expert sources, like celebrities.

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