What does an EEG show about dementia?

An EEG (electroencephalogram) can reveal abnormal brain wave patterns in individuals with dementia, such as generalized slowing of brain activity, which is often associated with cognitive decline. In particular, it may show decreased alpha waves and increased theta and delta waves, indicating disrupted neural communication. While an EEG cannot diagnose dementia on its own, it can help differentiate between types of dementia and assess the severity of cognitive impairment.