“We measure every student pre- and post-training with a version of the Woodcock-Johnson general intelligence test,” said Ken Gibson, who began franchising LearningRx centers in 2003, and has data on more than 30,000 of the nearly 50,000 students who have been trained. “The average gain on I.Q. is 15 points after 24 weeks of training, and 20 points in less than 32 weeks.”
The three other large cognitive training services — Lumosity, Cogmed and Posit Science — dance around the question of whether they truly raise I.Q. but do assert that they improve cognitive performance.
Detterman said of brain training, “It’s probably not harmful. But I would tell parents: Save your money.