A study in JAMA Neurology found patients with early Alzheimer's or mild cognitive decline who also had epilepsy or subclinical epileptic brain activity showed symptoms of cognitive decline 5.5 to 6.8 years before those who did not have epilepsy. Researchers also found that 55% of epilepsy in Alzheimer's and MCD was nonconvulsive, instead presenting as aphasia, amnestic spells, sensory phenomena or deja vu.

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