The dot cancellation test or Bourdon–Wiersma test is a commonly used test of combined

visual perception Visual perception is the ability to interpret the surrounding environment through photopic vision (daytime vision), color vision, scotopic vision (night vision), and mesopic vision (twilight vision), using light in the visible spectrum reflecte ...

and

vigilance Vigilance may refer to: * Alertness * Vigilance, a creature ability in the ''Magic: The Gathering'' collectible card game * ''Vigilance'' (album), by Threat Signal * Vigilance (behavioural ecology), the watchfulness of prey for nearby predator ...

. The test has been used in the evaluation of

stroke A stroke is a medical condition in which poor blood flow to the brain causes cell death. There are two main types of stroke: ischemic, due to lack of blood flow, and hemorrhagic, due to bleeding. Both cause parts of the brain to stop functionin ...

where subjects were instructed to cross out all groups of four dots on an A4 paper. The numbers of uncrossed groups of four dots, groups of dots other than four crossed, and the time spent (maximum, 15 minutes) were taken into account. The Group–Bourdon test, a modification of the Bourdon–Wiersma, is one of a number of

psychometric Psychometrics is a field of study within psychology concerned with the theory and technique of measurement. Psychometrics generally refers to specialized fields within psychology and education devoted to testing, measurement, assessment, and ...

tests which trainee

train driver A train driver, engine driver, engineman or locomotive driver, commonly known as an engineer or railroad engineer in the United States and Canada, and also as a locomotive handler, locomotive operator, train operator, or motorman, is a pers ...

s in the UK are required to pass. The test is based on the work of French psychologist Benjamin B. Bourdon (1860–1943) and Dutch neurologist (1858–1940).Bourdon test definition
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References

Further reading