Types of Psychological Evaluations
Norm-Referenced
IQ/Achievement Tests
IQ tests and academic achievement tests are the most familiar norm-referenced tests for most people. In either of these types of tests, a series of tasks are presented to the person being evaluated, and the person's responses are graded according to carefully prescribed guidelines. After the test is completed, the results can be compiled and compared to the responses of a norm group usually composed of people at the same age or grade level as the person being evaluated.
IQ tests and academic achievement tests are designed to be administered to either an individual (by a trained evaluator) or to a group of people (paper and pencil tests). The individually-administered tests tend to be more comprehensive, more reliable, more valid and generally to have better psychometric characteristics than group-administered tests. Of course, individually-administered tests are more expensive to administer because of the need for a trained administrator (psychologist, school psychologist, or psychometrician), and the limitation of working with just one person.
Neuropsychological tests
Neuropsychological tests are specifically designed tasks used to measure a psychological function known to be linked to a particular brain structure or pathway.
They are typically used to assess impairment after an injury or illness known to affect neurocognitive functioning, or when used in research, to measure differences in certain neuropsychological abilities between experimental groups.
Personality Tests
Psychological tests of personality function generally fall into the two broad categories of objective tests and projective tests. Objective tests have a restricted response format, such as allowing for true or false answers. A prominent example of an objective personality test would be the Minnesota Multiphasic Personality Inventory. Projective tests allow for a much freer type of response. An example of this would be the Rorschach test, in which a person states what they see in ink blots on ten cards.
There is considerable controversy regarding the value and validity of projective testing. Nevertheless, both types of tests continue to be used in modern psychological practice.
Types of personality tests include the Rorschach test, the Minnesota Multiphasic Personality Inventory, Myers-Briggs Type Indicator, and the Thematic Apperception Test. Critics have pointed to the Forer effect to suggest that some of these appear to be more accurate and discriminating than the really are.
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