I am training myself to become ambidextrous. Right now I am using my computer mouse on my left hand (it is a symmetric mouse so you can hold it with your left hand), and it is driving me nuts but I am keeping at it. I am playing thought intensive games on my computer (chess, minesweeper) with my left hand.
I also spin my pen every now and then to train those weak pathetic muscles.
I eventually want to write and draw with my left hand almost as good as my right hand.
Can this somehow improve my cognitive abilities, or do the opposite?