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Measures long-term focused attention and the visual differentiation of a relevant signal when distractor signals are present. Signal detection theory describes the perception of weak signals against a constantly changing background. It addresses the following question: under what conditions can a person detect the presence of a weak signal against a background of irrelevant signals or among other signals that could sometimes be confused with the relevant signal? The test is used mainly in personnel psychology (safety assessments in aviation psychology), in clinical neuropsychology and in sports psychology. In the clinical context it is useful in identifying deficits, such as those that occur in connection with neglect.
S1: Standard (white signals on a black background) S2: Standard, inverted (black signals on a white background) S3: Short signal duration S4: Signal balance (neglect assessment)
The screen shows a display of dots that appear and disappear at random. The respondent must react as soon as four dots form a square.
approx. 14-20 minutes, depending on test form
Norms for ages 8+.
The main variable is Focussed attention as a measure of visual detection performance. It is the number of correct and delayed reactions over the course of the test.
Additionally, the Median detection time is scored as a subsidiary variable. It is the average time taken to make a correct response over the course of the test.