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Each of 12 stimuli (circles of different colors, numbers and sizes) is associated with a different reward magnitude and probability. These include all combinations of (100 and 200) point rewards with (0, 0.25, 0.5, 0.75 and 1) probabilities, plus 300 and 400 rewards with 0.5 probability. Participants are first trained to learn the probabilities and outcomes associated with each stimulus. Next, on each trial, a stimulus appears in one of four quadrants of the screen, and participants indicate which quadrant using a button press.


non-choice task to study expected value and uncertainty

Definition contributed by Anonymous
Phenotypes associated with non-choice task


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IMPLEMENTATIONS of non-choice task
No implementations have been added.
EXTERNAL DATASETS for non-choice task
No implementations have been added.

Experimental conditions are the subsets of an experiment that define the relevant experimental manipulation.


You must specify conditions before you can define contrasts.

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.

response time
areas of activation
number of risky choices
expected value

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).


Reward value coding distinct from risk attitude-related uncertainty coding in human reward systems.
Tobler PN, O'Doherty JP, Dolan RJ, Schultz W
Journal of neurophysiology (J Neurophysiol)
2007 Feb