Personally I don't think you can. Improved mental skills in one area are just going to kick of activities in other areas and the more you use your brain the better your brain works for you.
It is interestng to note when you follow the forum for image streamers that they start exploring other brain activity. Games like becoming ambidextrous, juggling, brain gym exercises, standing on one leg with eyes closed etc.
I personally think that image streaming (as well as other brain exercises) create an 'appetite' for more and to handle IQ test you do need to experience more.
Have fun with it.
Alex
