Dual n-back task
Scorecard!
Type#Total (s/a)
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In n-back task you need to remember n previous spatial or auditory stimuli. If the given stimulus presented is same as
any of the n previous, press
'a' (spatial) or 'l' (auditory).
'q' = cancel task [more]
Start task
Spatial Dual Auditory
Select duration

Train (15 trials, 45 sec)
Short (50 trials, 2.5 mins)
Normal (100 trials, 5 mins)
Long (200 trials, 10 mins)

Update 2009-11-28

I noticed there is a commercial dual-n-back software, which is much more convenient to use than this free web applet. You can download it on your computer or use it with iPhone. It got "Top Ten Tech Gifts Under $50" from PC Mag online, so check it out: