The only drug currently licensed in England and Wales for treating frontotemporal dementia is rivastigmine.

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All participants were able to understand sincere comments, but patients with frontotemporal dementia had trouble understanding lies and sarcasm.

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Tracy Mobley can have good days, when she shows no symptoms of frontotemporal dementia, which affects the areas of the brain associated with personality, behavior and language.

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This kind of change in musical taste was not seen in any of the Alzheimer's patients, and thus appears to be specific to those with frontotemporal dementia.

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These drugs are useful in certain variants of frontotemporal dementia.

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In a study published last year in the journal Cortex, Dr. Rankin and her colleagues studied the ability to detect sarcasm in 102 patients who had been diagnosed with four progressive diseases that lead to memory loss: frontotemporal dementia, Alzheimer's disease, progressive supranuclear palsy and vascular-cognitive impairment.

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Rankin and her team focused on a a specific type of neurodegenerative disease called frontotemporal dementia, or FTD, a group of disorders in which patients can experience behavioral symptoms such as personality changes, a loss of inhibition and social tact as well as language difficulties, such as an inability to understand words.

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And other studies have remarked on how frontotemporal-dementia patients sometimes gain new talents.

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