The process of reporting possible signs of dementia within agreed ways of workings usually works like this - a physician would receive a patient and view his symptoms - he would check for his memory capabilities and his decision-making style. If he would see that the patient exhibits certain memory deficits, this would probably warrant further investigation whichcould lead to a dementia diagnosis.
this is because they are trying to end the pain they have inside and for the moment while doing these activities the pain goes away or is transferred to another thing.