Even though people experiencing dementia become unable to recount what has just happened, they still go through the experience—even without recall.
The psychological present lasts about three seconds. We experience the present even when we have dementia. The emotional pain caused by callous treatment or unkind talk occurs during that period.
The moods and actions of people with dementia are expressions of what they have experienced, whether they can still use language and recall, or not.

Judy Cornish