Synonyms: 2nd-order decision task, second-order rule acquisition
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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 two years ago:In this task, subjects are presented with 18 stimuli composed of three dimensions: 3 shapes, 3 orientations and 2 colored borders. Subjects had to learn one of three key responses for each of the 18 stimuli. In the "flat" condition, the 18 stimuli to 3 responses mapping was arbitrary, requiring subjects to individually learn each of the 18 associations. In a hierarchical condition, the colored borders indicated whether "orientation" or "shape" determined the response. This simplifies performance if subjects learn this hierarchical structure.View Term Event Log