The studies on Dual-N-Back increasing IQ have been all over the place. Some positive some negative. With the larger more careful trials coming up negative.
But IQ isn't working memory, attention, or executive function. And the findings on Dual-N-Back and working memory are less ambiguous and more positive.
Also there have been some more interesting studies done on Dual-N-Back in terms of changing Type 1 dopamine receptor density, as well as volume changes in certain parts of the pre-frontal cortex. So it really does seem like it's doing something even if that doesn't translate into an IQ change.
