Fits, trances, visions, speaking in tongues, clairvoyance, out-of-body experiences, possession. Believers have long viewed these and similar involuntary experiences as religious--as manifestations of God, the spirits, or the Christ within. Skeptics, on the other hand, have understood them as symptoms of physical disease, mental disorder, group dynamics, or other natural causes. In this sweeping work of religious and psychological history, Ann Taves explores the myriad ways in which believers and detractors interpreted these complex experiences in Anglo-American culture between the mid-eighteenth and early-twentieth centuries. Taves divides the book into three sections. In the first, ranging from 1740 to 1820, she examines the debate over trances, visions, and other involuntary experiences against the politically charged backdrop of Anglo-American evangelicalism, established churches, Enlightenment thought, and a legacy of religious warfare. In the second part, covering 1820 to 1890,