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Subjects are presented with three three-dimensional (e.g., color, texture, shape) stimuli. Each dimension has three exemplars so all exemplars are on the screen at any time. One dimension (e.g., color) determines reward, and one exemplar in this dimension (e.g. "red") has a higher probability of reward than the others (75% vs. 25%). If rewarded, the subject earns 1 point (the subject is instructed to maximize points). After 15-25 trials the relevant dimension and higher probability feature is switched. This switch is either signaled to the participant (in most versions so far) or not (in one paper).
Definition contributed by YNiv about nine months ago

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Dimensions task has been asserted to measure the following CONCEPTS

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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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REVISION 1

Definition contributed by JLi about one year ago:Subjects are presented with three three-dimensional (border color, texture, shape) stimuli. Each dimension has three exemplars so all exemplars are on the screen at any time. One exemplar of one dimension (e.g. "red" or "striped") has a higher probability of reward than the others (75% vs. 25%). If rewarded, the subject earns 1 point (the subject is instructed to maximize points). After 15-25 trials the higher probability feature is switched. This switch will either be to another feature in the same dimension (e.g "spots" to "stripes") or across dimensions ("spots" to "red").

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