There are five intelligences that a human being may possess. These are musical, bodily-kinesthetic, logical-mathematical, linguistic, spatial interpersonal, intrapersonal. Each intelligence is not affected by the damage of the other intelligences but each intelligence, more often than not, need other intelligences to work or be effective. Each intelligence is present when the brain is fully healthy but there are exceptions to this such as when an autistic person can play beautiful music.
Brain damage causes ineffective intelligences, therefore causing sickness or disease such as Alzheimer’s. Intelligence usually manifests at first exposure to it and is recognized even before formal or advanced training. The existence of intelligence is biologically and scientifically proven to be linked to the function of the brain and does not exist as some unexplained phenomenon.