Final answer:
Cognitive studies examine the decline in intelligence with aging. Neurologically, it is associated with changes in the brain. Engaging in mentally and physically stimulating activities can delay cognitive decline.
Step-by-step explanation:
Cognitive studies in the field of psychology examine how people think and the processes involved in cognition. When studying the decline in intelligence with aging, cognitive psychologists focus on two types of intelligence: crystallized intelligence, which is based on accumulated knowledge and skills, and fluid intelligence, which involves information processing abilities and reasoning.
Neurologically, cognitive decline with aging is associated with changes in the brain. The brain cells decrease in number, and there is degeneration of certain connections in the brain. This results in slower processing speed and decreased cognitive abilities, particularly in fluid intelligence.
However, research has shown that engaging in mentally and physically stimulating activities can delay cognitive decline and reduce the risk of cognitive impairment and dementia in old age.