PSYC31H3 Chapter Notes - Chapter 4: Impulsivity, Grip Strength, Igloo
14 Oct 2016
School
Department
Course
Professor
Document Summary
The concept of behavioral deficit presupposes some ideal, normal, or prior level of functioning against which the patient"s performance may be measured. Cannot determine performance is impaired until compared against other measures: norm for digit span is 7+/- 2, the more deviant the score, the more likely something abnormal may be going on. This level, the comparison standard, may be normative derived from an: appropriate (derived from a normative population) Population average: the normative comparison standard may be an average or middle (median) score. Important that sample is representative of everyone who is about to take the test. Variables that would disadvantage someone if the sample weren"t representative: Differences between an undergrad and a 70 yr. old. Not many tests stratified by all three demographic characteristics. People who fall within one sd of the average considered average. 34% of the cases will fall within the mean with one sd above or below the average.
