The Gordon Diagnostic System is a series of game-like tests that assess both attention and impulsivity. The system includes a "vigilance task", which shows the child a series of digits, one at a time. The child must identify every time a particular sequence of numbers appear (e.g. a 1 followed by a 9). This test is performed once visually, and once with the child listening to the numbers. There is also a test to check for impulsivity. The Gordon Diagnostic System has been validated for children between the ages of 4 and 16.
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