Dementia is a syndrome, not a disease. Dementia is a group of symptoms that affects mental cognitive tasks such as memory and reasoning. Dementia is an umbrella term that Alzheimer's disease can fall under. It can occur due to a variety of conditions, the most common of which is Alzheimer's disease
https://player.whooshkaa.com/shows/dementiaq
episode 18: Laugher Makes Your Brain Work Better Against Alzheimers
Latest study shows that laughing can make short-term memory better in older adults, linking laughter to delaying and preventing cognitive decline and dementia.