Scientists found that damage in a certain part of the brain is linked to an increase in religious fundamentalism. In particular, lesions in the ventromedial prefrontal cortex reduced cognitive flexibility – the ability to challenge our beliefs based on new evidence.

The researchers, led by Jordan Grafman of Northwestern University, utilized data gathered from Vietnam War veterans as part of the Vietnam Head Injury Study. They compared levels of religious fundamentalism between 119 vets who had lesions and 30 veterans who didn’t.

The study further confirms that the prefrontal cortex is associated with religious beliefs and is the latest in a number of recent studies that look to find the neurological basis for religion.