In his book The Overflowing Brain: Information Overload and the Limits of Working Memory, Dr. Klingberg discusses what working memory is and how it is highly correlated with attention control, IQ, general intelligence, and problem solving ability. He goes on to explain how this topic relates to ADHD and the treatment of this disorder.
I have a B.S. in Psychology that is several years old, so I had high hopes of updating my knowledge about attention and working memory. But, I was disappointed to find the book did not really add much to my understanding of these topics. In addition, the quality of the book itself was underwhelming. There are numerous spelling mistakes and other typographical errors throughout the book. However, if you don't have the benefit of a Psychology degree and you can look past the typos, you might find this book to be an interesting book about how the brain works.