Arteriosclerotic dementias, also known as vascular dementias, are characterized by a decline in cognitive abilities due to abnormalities in blood vessels that supply the brain. Some possible antonyms for this medical term could include conditions such as normal aging, sharp cognition, and mental vitality. Unlike arteriosclerotic dementias, which involve changes in blood flow and structure of the brain, normal aging does not necessarily lead to cognitive impairment. Similarly, someone with sharp cognition would have no difficulty with memory, thinking, and processing speed. Mental vitality refers to a state of robust mental health, in which an individual has high levels of energy, creativity, and motivation.