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Public Domain · 1895

Kraepelin Continuous Arithmetic Test: Sustained mental work test

Emil Kraepelin's test of sustained mental work. Subjects perform long series of simple additions under time pressure. Used to measure work curves, fatigue, attention span, and concentration. Still in modified use today in Japan as the Uchida-Kraepelin test for vocational selection.

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About the Kraepelin Continuous Arithmetic Test

Kraepelin's Arithmetic Test required subjects to add pairs of single-digit numbers continuously for periods of 15-60 minutes, with brief rest periods. The test produced a "work curve" showing changes in speed and accuracy over time, revealing patterns of fatigue, recovery, and attention drift.

Kraepelin used the test to differentiate psychiatric conditions: depressed patients showed flat low-output curves, manic patients showed initial high output followed by collapse, neurasthenic patients showed exaggerated fatigue. The test became standard in early 20th-century European psychiatry.

A modified version, the Uchida-Kraepelin Performance Test, remains in widespread use in Japan today for vocational selection by railway companies, airlines, and the Japan Self-Defense Forces. It is among the most-administered psychological tests in the world, with millions of administrations per year.

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Kraepelin Continuous Arithmetic (1895): rapid mental addition under time pressure. 60 simple addition problems; complete as many as you can. Original test required 15-60 minute work sessions; web version is self-paced.

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About these items: These Kraepelin Continuous Arithmetic Test items are originally-written reconstructions in the tradition of the original 1895 test, NOT verbatim copies of the historical items. Where the original is a 1-on-1 oral or physical-apparatus test (e.g., examiner shows a card, child draws a shape), we have adapted the format to self-administered multiple choice.

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Source

All test materials and historical content on this page are transcribed from:

Kraepelin, E. (1895). Der psychologische Versuch in der Psychiatrie. Psychologische Arbeiten, 1, 1-91.

Emil Kraepelin (1856-1926) was a German psychiatrist, the founder of modern scientific psychiatry. His arithmetic test was the first systematic measure of sustained cognitive work.

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This page is part of the Historical IQ Tests Archive. Editorial content, transcription notes, and curation are released under Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0). Public-domain primary sources retain their public-domain status. BibTeX · RIS

Historical test materials are obsolete and are not valid modern IQ assessments. This page is preserved for educational, research, and historiographic purposes.

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