As someone else pointed out: more isn't better. There's an optimum, and it depends on the task. There are some "in vivo" studies about connections in the young

As someone else pointed out: more isn't better. There's an optimum, and it depends on the task. There are some "in vivo" studies about connections in the young cat's visual cortex. It starts out very connected, and most of the connectivity is lost, while structures form.