The dawn of the 21st century has seen the emergence of two new potential somatic treatments for psychiatric illness, vagus nerve stimulation and transcranial magnetic stimulation, the subject of the book under review. This edited volume provides an excellent introduction for students, clinicians, and researchers wanting to learn about transcranial magnetic stimulation. It begins with chapters reviewing the history and physics of the procedure that are informative and accessible to readers who have no expertise in electrophysiology and provide an appreciation of the methodologic limitations of the current technology. The remainder of the book comprehensively reviews studies done through 1999 using transcranial magnetic stimulation as a probe to understand basic brain neurophysiology and as a therapeutic agent. Although more data need to be accumulated, the evidence reviewed in this book supports the safety of this procedure as a technique for examining brain function, particularly for briefly interrupting the function of specific brain regions but also as a probe for examining neural plasticity and connectivity.