Updated Myers' Psychology for the AP® Course, 3E - Module 39

cohort

a group of people sharing a common characteristic, such as from a given time period.

crystallized intelligence

our accumulated knowledge and verbal skills; tends to increase with age.

fluid intelligence

our ability to reason speedily and abstractly; tends to decrease with age, especially during late adulthood.

cross-sectional study

research that compares people of different ages at the same point in time.

longitudinal study

research that follows and retests the same people over time.

intellectual disability

a condition of limited mental ability, indicated by an intelligence test score of 70 or below and difficulty adapting to the demands of life. (Formerly referred to as mental retardation.)

Down syndrome

a condition of mild to severe intellectual disability and associated physical disorders caused by an extra copy of chromosome 21.