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Experimental conditions are the subsets of an experiment that define the relevant experimental manipulation.
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.
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).
Definition contributed by MLewis about five years ago:participant is presented with a series of letter strings constructed according to an artificial and finite set of rules, after which the participant must determine whether new strings follow or violate the grammar established by the first series.REVISION 1
Definition contributed by RPoldrack about six years ago:View Term Event Log