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 task and its attributes were duplicated from heat stimulation on November 28, 2015."
VSochat (about two years ago)
Woo CW, Roy M, Buhle JT, Wager TD
PLoS biology (PLoS Biol)
Citation added by VSochat about two years ago