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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).
"This seems more like a stimulus than a particular task; should it have its own entry, or would there be an elegant way to fold into another?"
MLewis (about five years ago)
"Initial definition from the BrainMapLex.xls file located in the documentation section of: http://brainmap.org/scribe/index.html"
BGregory (about seven years ago)
Definition contributed by BGregory about seven years ago:Subjects view a flashing checkerboard.REVISION 1
Definition contributed by BGregory about seven years ago:Subjects view a flashing checkerboard. (from the BrainMapLex.xls file located in the documentation section of: http://brainmap.org/scribe/index.html)View Term Event Log