DONALD K. ROUTH WHAT THIS BOOK IS ABOUT A reader who happens onto this book on the library shelf may find the title a puzzle. Learning is one broad subject. Speech is another. And the "complex effects of punishment" might seem far afield from either. Perhaps, intrigued by this apparent diversity and wanting to discover what common theme underlies it, the reader may begin leafing through the chapters. The first one recounts a series of studies of rats-using...