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A measure of attention and working memory. In this task, participants are asked to pay attention to fractal designs displayed on the computer screen, one at a time, and to press the spacebar according to one rule: the 2-back. During the 2-back, the participant must press the spacebar whenever the design on the screen is the same as the one displayed before the previous one (i.e. in the series design A, design B, design A, the participant should press the spacebar on or immediately after the second design A . In all trials, the participant has 2500 ms to press the spacebar. The participant practice the 2-Back rule, in which he/she is allowed to make mistakes and then, when he/she completes all practices successfully, the task will begin.


sFNBx2, FNB2

Definition contributed by Anonymous
Penn Fractal N-Back has been asserted to measure the following CONCEPTS
No concepts assertions have been added.

Phenotypes associated with Penn Fractal N-Back


No associations have been added.


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No associations have been added.

IMPLEMENTATIONS of Penn Fractal N-Back
No implementations have been added.
EXTERNAL DATASETS for Penn Fractal N-Back
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.


No indicators have yet been associated.

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).


Working memory for complex figures: an fMRI comparison of letter and fractal n-back tasks.
Ragland JD, Turetsky BI, Gur RC, Gunning-Dixon F, Turner T, Schroeder L, Chan R, Gur RE
2002 Jul