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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).
"We have renamed the contrasts that refer to "fixed" or "demean" to reflect how they are referred to in the paper. I.E: references of "fixed" have been renamed to "average" and references of "demean" have been renamed to "parametric.""
VSochat (about two years ago)
Definition contributed by MLewis about five years ago:On each trial, participants pump a simulated balloon without knowing when it will explode. Each pump increases the potential reward to be gained but also the probability of explosion, which wipes out all potential gains for that trial. In most studies, balloon explosion probabilities are drawn from a uniform distribution, and participants must learn explosion probabilities through trial-and-error.REVISION 1
Definition contributed by TSchonberg about six years ago:On each trial, participants pump a simulated balloon without knowing when it will explode. Each pump increases the potential reward to be gained but also the probability of explosion, whichwipesoutallpotentialgains for that trial. Inmoststudies,balloonexplosionprobabilities are drawn from a uniform distribution, and participants must learn explosion probabilities through trial-and-error.View Term Event Log
Schonberg T, Fox CR, Mumford JA, Congdon E, Trepel C, Poldrack RA
Frontiers in neuroscience (Front Neurosci)
Citation added by NPicchetti about four years ago
Helfinstein SM, Schonberg T, Congdon E, Karlsgodt KH, Mumford JA, Sabb FW, Cannon TD, London ED, Bilder RM, Poldrack RA
Proceedings of the National Academy of Sciences of the United States of America (Proc Natl Acad Sci U S A)
2014 Feb 18
Citation added by VSochat about two years ago