Synonyms: two-stage decision task
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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).
Definition contributed by JLi about two years ago:Subjects participate in a two-stage decision task where they make a binary choice in each stage (stage 1&2) and probabilistically receive reward after the final stage (stage 2). First-stage choices are primarily associated with one of two second-stages (labeled 2a and 2b): one first-stage choice leads to 2a 70% of the time and 2b 30% of the time, while the opposite is true of the other first-stage choice. Each second-stage choice has its own probability of reward (constantly changing via a random-walk). The ultimate goal of the subject is to maximize reward, which are only given during the second stage. The ideal subject would identify the most rewarding second-stage stimulus and make first-stage choices that make it more likely to arrive at the relevant second stage.View Term Event Log