A conceptual replication of the well known Zeigarnik effect was attempted with persons who had organic brain dysfunction. Data from a sample of 56 mentally retarded persons showed a significant difference in the recall of uncompleted versus completed tasks, thus establishing the Zeigarnik effect in that population.
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LewinK. (1939) Principles of topological psychology. New York: McGraw-Hill.
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ZeigarnikB. (1939/1965) The pathology of thinking. (HaigB., Transl.) New York: Consultants Bureau.