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A version of the continuous performance task in which subjects are told to make one response for the letter X when it was preceded by the letter A, and another response for all other stimuli. AX trials are "target trials"; in these types of trials a valid cue is followed by a valid probe. The 3 other trial types are "Non-target trials" in which either a valid cue is followed by an invalid probe ("AY" type trials) or an invalid cue is followed by either a valid or invalid probe ("BX" or "BY" probes, respectively).
Definition contributed by CWhite about two years ago

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Continuous Performance Test - AX version has been asserted to measure the following CONCEPTS
as measured by the contrast:
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DISORDERS associated with Continuous Performance Test - AX version
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IMPLEMENTATIONS of Continuous Performance Test - AX version
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EXTERNAL DATASETS for Continuous Performance Test - AX version
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CONDITIONS
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Experimental conditions are the subsets of an experiment that define the relevant experimental manipulation.

CONTRASTS
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In the Cognitive Atlas, we define a contrast as any function over experimental conditions. The simplest contrast is the indicator value for a specific condition; more complex contrasts include linear or nonlinear functions of the indicator across different experimental conditions.

INDICATORS
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An indicator is a specific quantitative or qualitative variable that is recorded for analysis. These may include behavioral variables (such as response time, accuracy, or other measures of performance) or physiological variables (including genetics, psychophysiology, or brain imaging data).


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