Could meditation help with reducing memory and concentration problems? As with ADD or ADHD?

There have been studies showing that meditation can help dealing with depression, stress and anxiety. But are there meditation techniques that help with ADD and ADHD problems? And if there are, which ones? Since three of the unwholesome mental factors seem to coincide with ADD/ADHD symtoms: Muṣitasmṛtitā - forgetfulness Asaṃprajanya - non-alertness, inattentiveness Vikṣepa - distraction, desultoriness