The most common cause of the loss of this function in the U.S. is side effects from the powerful antibiotic gentamicin.

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"The worst impact is the loss of biological function that these wild animals fulfil in nature, " he told the BBC.

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But the groups who played the computer game showed a clear improvement compared with the normal loss of cognitive function as people age.

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An operation to remove the prostate can have serious side-effects, such as loss of control of urinary function, so doctors are unwilling to operate unless the cancer appears life-threatening.

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This operation is intended to restore bladder function to people with spina bifida, a congenital defect that causes nerve damage and a loss of sensation and muscle function below the waist.

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The device was worn for up to 24 hours without loss of function or skin irritation.

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Scotland's lineout failed to function during last weekend's battling loss to England but the home side dominated that area, stealing the first four Italian throw-ins, with Richie Gray particularly impressive.

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