In earlier cross-sectional studies of age-related changes in intelligence, the typical finding was that crystallized intelligence _________ and fluid intelligence _________ during middle adulthood.
A) remained the same or increased; remained the same or increased
B) declined; declined
C) remained the same or increased; declined
D) declined; remained the same or increased

Question

Quizplus · Accepted Answer

Crystallized intelligence (accumulated knowledge) tends to remain the same or increase during middle adulthood due to the accumulation of experience and education, while fluid intelligence (ability to solve new problems and abstract thinking) tends to decline during this period due to declines in processing speed and working memory.

In Earlier Cross-Sectional Studies of Age-Related Changes in Intelligence, the Typical