For the first time, researchers from Johns Hopkins University in US have linked basic spelling difficulties to seemingly unrelated regions of the brain.

Researchers studied 15 years' worth of cases in which 33 people were left with spelling impairments after suffering strokes. Some of the people had long-term memory difficulties, others working-memory issues.

With long-term memory difficulties, people can not remember how to spell words they once knew and tend to make educated guesses.

They could probably correctly guess a predictably spelled word like 'camp,' but with a more unpredictable spelling like 'sauce,' they might try 'soss.'

Researchers used computer mapping to chart the brain lesions of each individual and found that in the long-term memory cases, damage appeared on two areas of the left hemisphere, one towards the front of the brain and the other at the lower part of the brain towards the back.

In working memory cases, the lesions were primarily also in the left hemisphere but in a very different area in the upper part of the brain towards the back.

The findings were published in the journal Brain.

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