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The occipital lobe is the visual processing area of the brain and a stroke in this area can cause an array of visual impairments.

The 25-year-old revealed in March that she sustained a "left occipital infarct" last year but there was no lasting damage to her brain or vision.

In a post on social media, external-link Roebuck said tests found she had suffered a "left occipital infarct" but there was no lasting damage to her brain or vision.

For example, in the left occipital area, those with concussion and headaches had more iron accumulation than those with no concussion or headaches.

They were able to show that changes in two important brain regions, the hippocampus and the occipital lobe, as well as their interaction, have an influence on the impaired recall of personal memories in aphantasia.