A delusion is defined as a false idea, sometimes originating in a misinterpretation of a situation. When an individual has a delusion, she may think that family members are stealing from her or that she's in another place when she's actually still in her own home. A hallucination, in contrast, is a false perception of objects or events, and is sensory in nature. When a person with Alzheimer's has a hallucination, she can see, hear, smell, taste, or even feel something that isn't really there. Hallucinations are caused by changes within the brain that result from Alzheimer's disease.
Hallucinations are visual and auditory.
The person may see the face of a former friend in a curtain or she may see insects crawling on her hand. In other cases. Hallucinations can be frightening to the person and the caregiver. On some occasions, the individual may see threatening images or just ordinary pictures of people, situations or objects from the past. Although you can create an environment to manage wandering, you won't be able to control the person's hallucinations or prevent them from occurring.