Intelligence test
measure a client’s intellectual abilities
Achievement tests
in contrast, measure what a client has accomplished with those intellectual abilities
Intelligence
a concept that does not have a fully agreed upon definition, but which is characterized by certain abilities (speed of mental processing, sensory capacity, abstract thinking, imagination, adaptability, capacity to learn through experience, memory, reasoning, and inhibition of instinct)
Neuropsychological tests
focus on issues of cognitive or brain dysfunction, including the effects of brain injuries and illnesses
Charles Spearman
Intelligence is a singular characteristic.
“g” (general intelligence)
Spearman’s general intelligence that represents a person’s global, overall intellectual ability
Louis Thurstone
an opponent of Spearman who proposed a theory in which intelligence is understood as numerous distinct abilities that have little relationship to each other
Hierarchical model of intelligence
Spearman and Thurstone’s compromise in which specific abilities (“s”) exist and are important, but they are at least somewhat related to one another and to a global, overall, general intelligence (“g”)
James Cattell
proposed two separate intelligences (fluid and crystallized)
Fluid intelligence
the ability to reason when faced with novel problems
Crystallized intelligence
the body of knowledge one has accumulated as a result of life experiences
John Carroll
proposed the three-stratum theory of intelligence
Three-Stratum theory of intelligence
Carroll’s theory of intelligence in which intelligence operates at three levels: a single “g” at the top, eight broad factors immediately beneath “g,” and more than 60 highly specific abilities beneath these broad factors
Cattel-Horn-Carrol (CHC) theory of intelligence
the combination of Cattell and Carroll’s theories that features 16 broad cognitive abilities that collectively include 80 highly specific abilities
David Wechsler’
created the Wechsler intelligence tests, each the most widely used among psychologists for its respective age range
-Wechsler Adult Intelligence Scale—Fourth Edition (WAIS-IV)
-Wechsler Intelligence Scale for Children—Fifth Edition (WISC-V)
-Wechsler Preschool and Primary Scale of Intelligence—Fourth Edition (WPPSI-IV)
full-scale intelligence score
reflects a general, global level of intelligence (“g”)
Index scores
(4 or 5): represent increasingly specific areas of ability (“s”)
Subtest scores
about a dozen: represent increasingly specific areas of ability (“s”)
Verbal Comprehension Index
verbal concept formation and verbal reasoning
Perceptual Reasoning Index
fluid reasoning, spatial processing, and visual-motor integration
Working Memory Index
capacity to store, transform, and recall incoming information and data in short-term memory
Processing Speed Index
ability to process simple/rote information rapidly and accurately
normative data
That is, the manual for each Wechsler test includes norms collected from about 2,000 people. These normative groups closely match recent U.S. Census data in terms of gender, age, race/ethnicity, and geographic region, among other variables
Cultural fairness
the extent that an intelligence test is based on culture-specific concepts and the level of fairness exhibiting in assessing the intelligence of people of other cultures