Complex Working Memory (CWM) span task is a brain training exercise that improves working memory and fluid intelligence.
If you are not familiar with the CWM task yet, please, read the tutorial page before starting the exercise.
Current implementation is based on the task used for the research "Expanding the mind’s workspace" by Jason M. Chein and Alexandra B. Morrison. A brief report for the research can be found here.
In short, the study demonstrates success in using a CWM task to improve working memory, cognitive control, and reading comprehension.