Thought this was interesting. DD is in occupational therapy for focus issues/poor motor skills and the therapist has been having her do IM therapy for part of each session each week. DD dramatically improved each week and then one morning I forgot to put on her ritalin patch. I sent her to school and then to therapy and warned the therapist that she was a bit hyper because of not being medicated. When I went to pick her up, the therapist had her doing IM and her score had dropped a dramatic 50 percent. She looked like she was focused to me but apparently it involves some degree of concentration and motor skills above just sitting still and looking at a screen.
Whether IM therapy actually helps a kid how to learn to focus or not (in real life situations), I have no idea. I just thought it was interesting having objective evidence of decreased motor/attention skills when not medicated.