Internet multi-tasking is both a magnificent research tool and an infuriating distraction. But, like it or not, it's transforming the human brain. Neuroscientists are sure about that. What they're not sure about is whether the change is for better or worse. In the meantime, debate is raging. Critics insist it's reducing the ability to focus, enforcing shallowness, stifling the creative impulse and breaking connections between human beings. Advocates say the media revolution is producing new ways of thinking and more human connectedness than ever before. A recent article touched a nerve in so many readers of the New York Times that editors say it was the most frequently emailed they've ever seen.