2. g or g-factor: the single, general factor for mental ability assumed to underlie intelligence in some early theories of intelligence.
3. Fluid intelligence: intelligence that reflects information-processing capabilities, reasoning and memory.
4. Crystallized intelligence: the accumulation of information, skills and strategies that are learned through experience and can be applied in problem-solving situations.
5. Theory of multiple intelligence: Gardner’s intelligence theory that proposes that there are eight distinct spheres of intelligence.
6. Practical intelligence: according to Stenberg, intelligence related to overall success in living.
7. Emotional intelligence: the set of skills that underline the accurate assessment, evaluation, expression and regulation of emotions.
8. Intelligence tests: tests devised to quantify a person’s level of intelligence.
9. Mental age: the average age of individual who achieve a particular level of performance on a test.
10. Intelligence quotient (IQ): a score that takes into account and individual‘s mental and chronological ages.
11. Achievement test: a test designed to determined a person’s level of knowledge in a given subject area.
12. Aptitude test: a test designed to predict a person’s ability in a particular area or line of work.
13. Reliability: the property by which tests measure consistently what they are trying to measure.
14. Validity: the property by which tests actually measure what they are supposed to measure.
15. Norma: standard of test performance that permit the comparison of one person’s score on a test with the scores of other individuals who have taken the same test.
16. Mental retardation (or intellectual disability) – a condition characterized by significant limitations both in intellectual functioning and in conceptual, social and practical adaptive skills.
17. Fetal alcohol syndrome: the most common cause of mental retardation in newborns, occurring when the mother uses alcohol during pregnancy.
18. Familial retardation: mental retardation in which no apparent biological defect exists but there is a history of retardation in the family.
19. Intellectually gifted: the 2 to 4 percent of the population who have IQ scores greater than 130.
20. Culture-fair IQ test: a test does not discriminate against the members of any minority group.
21. Heritability: a measure of degree to which a characteristic is related to genetic, inherited factors.