Probably a rubbish study. You can probably do the same with programming languages and show that knowing Lisp, Java and C won't give you any cognitive advantages

Probably a rubbish study. You can probably do the same with programming languages and show that knowing Lisp, Java and C won't give you any cognitive advantages. Just stick to Java and you'll have plenty of "cognition". We'll all know this is (as decaffjoe pointed out) completely missing the forest for the trees.