I don't agree with the downvotes here. I tend to think people downvote short comments without really attempting to understand the value they're bringing to the

I don't agree with the downvotes here. I tend to think people downvote short comments without really attempting to understand the value they're bringing to the conversation. Conversely, people assume a long comment is insightful. It is a reasonable explanation that any increase in intelligence is just the subject getting better at the tests that are measuring intelligence. If you take the same IQ test over again, you're likely going to score a bit higher. But this certainly doesn't mean the act of taking the test made you smarter. You're simply getting better at using the tool used to measure intelligence. This made sense at least before the most recent study cited with the Dual-N-Back training. You're going to be hard pressed to explain that away.