A hallucination is a sensory experience of something that appears real but is simply created in our mind. Hallucinations are commonly experienced by persons living with dementia although exact estimates of their frequency differ. The frequency of hallucinations may also depend on the type of dementia. For example, as many as three quarters of persons diagnosed with dementia with Lewy bodies, and up to two-thirds of those with Parkinson’s Disease dementia, may at some point experience hallucinations.