IQ Training 1.25

the author of this app says:

IQ Training is an intelligence training. It uses a so called dual n-back task, which is a scientifically proven techique for improving your fluid intelligence.

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Wikipedia about dual n-back:

"The dual-task n-back task was proposed by Susanne Jaeggi et al. in 2003. In this variation, two independent sequences are presented simultaneously, typically using different types of stimuli, such as one auditory and one visual.
In a 2008 research paper Jaeggi et al. claim that practicing a dual n-back task can increase fluid intelligence, as measured in several different standard tests. This resulted in some attention from popular media, including an article in Wired.
In 2009, it was reported in Science that '14 hours of training over 5 weeks' led to measurable density changes for cortical dopamine neuroreceptors."

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In the Wired article, published 04.28.08 from Alexis Madrigal ("Forget Brain Age: Researchers Develop Software That Makes You Smarter") you can read:

"Brain researchers for the first time claim to have found a method for improving the general problem-solving ability scientists call fluid intelligence, otherwise known as 'smarts.'
Fluid intelligence was previously thought to be genetically hard-wired, but the finding suggests that with about 25 minutes of rigorous mental training a day, healthy adults could improve their mental capacities.
The method, if commercialized, could be a boon to the growing, multimillion-dollar market for 'brain fitness' software like Nintendo's Brain Age.
'The most important point of our work is that we can show that it is possible to improve fluid intelligence,' said Martin Buschkuehl, a psychology researcher based at the University of Bern, Switzerland. 'It was assumed that fluid intelligence was immutable.'
Fluid intelligence measures how people adapt to new situations and solve problems they've never seen before. Fluid intelligence differs from crystallized intelligence, which takes into account skills and knowledge that have been acquired -- like vocabulary, grammar and math.
It's not hard, for example, for students to improve their IQ scores by taking lots of IQ tests.
Trouble is, learning how to take IQ tests doesn't improve the underlying smarts. The students just get better at taking tests.

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And that's where Buschkuehl's research, which appears today in the journal Proceedings of the National Academy of Sciences, claims to be groundbreaking.
In a limited trial, he and his team were able to make 34 test subjects significantly better at answering IQ test questions after training them on a completely separate memory task.
David Geary, a professor at the University of Missouri and author of The Origin of Mind, who was not involved with the study, said training in one test generally doesnt generate gains on a different test.
"Transfer is tough to get," Geary said. "Training in task A doesnt typically improve performance on task B."
But in this case, subjects trained on a complex version of the so-called "n-back task" -- a difficult visual/auditory memory test -- improved their scores on a set of IQ questions drawn from a German intelligence measure called the Bochumer Matrizen-Test.
Initially, the test subjects scored an average of 10 questions correctly on the IQ test.
But after the group trained on the n-back task for 25 minutes a day for 19 days, they averaged 14.7 correct answers, an increase of more than 40 percent.
Buschkuehl's team postulates that the n-back task improves working memory -- how many pieces of information subjects can keep in their head -- as well as the ability to control the brain's attention. Fluid intelligence tests require those types of thinking, and the training improved performance in these underlying skills."