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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 6 letters presented in a 2x3 matrix. Each trial begins with a central fixation point followed by the training set of 6 letters to remember, followed by a retention interval. After the retention interval, subjects are presented with a cue, either TOP or BOT, which instructs the participant to forget the 3 letters presented in the cued location (forget set). The remaining 3 letters consist of the memory set. A central fixation point precedes the probe. Probes fall into three categories: 1) a letter that was in the memory set (positive), 2) a letter that was in the forget set (negative), and 3) a letter that was not in the initial training set (control). Subjects respond via key press, whether the probe was a positive probe or a forget/control probe.View Term Event Log