A combination of the intradimensional task and extradimensional task. Subjects are presented with two compound stimuli, each composed of a 'line stimulus" and a "shape stimulus". Thus the stimuli are multi-dimensional, in that they are composed of two separable features (line and shape). There are 8 different “lines”, and 8 different “shapes”. Subjects are told to choose between the two stimuli, and receive feedback on their choices. The correct choice depends upon the current target, where the target can take on any one of the 8 “lines” or 8 “shapes”. The current target shifts after several trials. This allows for an inter-dimensional shift, where the subject learns the new correct target within the same dimension (old target: “line 1”, new target “line 2”) or for an extra-dimensional shift, where the subject learns the new target outside of the old dimension (old target: “line 1” new target: “shape 2”).
Synonyms: IDED, IDED+reversal
Definition contributed by JLi about two years agoNo relations have yet been associated. CONDITIONS
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Experimental conditions are the subsets of an experiment that define the relevant experimental manipulation.
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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.
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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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