Find over 25,000 psychological definitions


Köhler effect

an increase in motivation that sometimes occurs among individuals working in groups on conjunctive tasks that require persistence but little coordination of effort. The effect is likely due to the increased effort expended by the less capable group members. Compare compensation effect. [first observed in 1926 by German researcher Otto Köhler]

Browse dictionary by letter

a b c d e f g h i j k l m n o p q r s t u v w x y z

Psychology term of the day

June 18th 2024

two-parameter model

two-parameter model

in item response theory, a model that specifies two parameters affecting an individual’s response to a particular test item: (a) the difficulty level of the item and (b) the item discriminability. See also Rasch model; three-parameter model.