Mod 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 demands of life.
• Down Syndrome: a condition of mild to severe intellectual disability and associated physical disorders caused by an extra copy of chromosome 21.