What is meant by "keep your attitude optimistic" regarding communication with a person with dementia?

This means that the best is being expected from the person despite the fact of the challenging physical ability or capability.

Explanation:

Dementia is a chronic disorder, and a collective term for declining memory and other thinking skills that negatively affect someone, preventing him from performing his daily activities normally.

This disorder is common to old people, and some of its causes are HIV, parkinson disease, Alzheimer's disease and traumatic brain injury among others.

Cholinesterase inhibitors and memantine are commonly prescribed medicine for dementia.