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In a typical test of memory span, a list of random numbers or letters is read out loud or presented on a computer screen at the rate of one per second. The test begins with two to three numbers, increasing until the person commits errors. At the end of a sequence, the person being tested is asked to recall the items in reverse of the presented order.

Definition contributed by Anonymous
backward digit span task has been asserted to measure the following CONCEPTS
as measured by the contrast:

Phenotypes associated with backward digit span task


No associations have been added.


No associations have been added.


No associations have been added.

IMPLEMENTATIONS of backward digit span task
No implementations have been added.
EXTERNAL DATASETS for backward digit span 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.

number of digits

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).