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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 JLi about one year ago:Subjects will be asked to remember a training set of 6 stimuli. After a delay interval, subjects are probed with a single stimulus. Via key press, subjects will be instructed to give one response if the probe was part of the training set for that trial and a different response if the probe was not part of the training set for that trial. Additionally, probes can fall under four conditions. On any given trial, the probe can be a recent positive (a member of the current trial training set and the preceding trial training set), non-recent positive (a member of the current trial training set but not the preceding trial training set), recent negative (a member of the preceding trial training set but not the current trial training set), or non-recent negative (not a member of the current trial training set or the preceding trial training set).View Term Event Log