Wanda Wyrwicka is not the best author in the world as she can be very dull and dry in some parts. However this very short book is crammed full of information. The author discusses everything from conditioning of internal organs including brain rhythms to complex reflexes. I really enjoyed her theoretical comments and the last chapter, which is a summary and conclusion of the entire book. The conclusion really ties all the information together and refreshes the reader of the main points. Overall a very good book on the subject matter although some main points are tricky but not too tough that the average reader cannot finish the book without learning and understanding the main theme.