other links in the topic:

"Brain Workshop is a free open-source version of the Dual N-Back mental exercise to increase Working Memory ..."

http://brainworkshop.sourceforge.net/

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"Dual N-Back, Brain Training & Intelligence forum & mailing list at Google Groups :"

http://groups.google.com/group/brain-training

http://groups.google.com/group/brain-training/files