This book will be useful for counsellors, psychotherapists, and mental health practitioners who may have felt frustrated with the limitations of talking-therapies and are now exploring the use of brainwaves to access the limbic areas of the brain to reprocess emotional trauma. Peniston and Kulkosky’s (1991) evidence suggesting that expert manipulation of specific brain frequencies could lead to the remission of traumatic symptoms in war veterans with PTSD was revolutionary at the time. They were among the first clinicians to use technology to tap into the brain’s ability to unlock traumatic memories, showing that unresolved emotional issues could be retrieved and potentially reprocessed in an objective and systematic way. It would take mainstream neuroscience another twenty years to finally explain this new form of neuroplasticity now known as memory reconsolidation. Alpha-Theta Neurofeedback in the 21st Century is a new handbook on neuromodulation treatment of emotional trauma and substance abuse. The second edition features three new chapters, including an introduction to neurofeedback, brainwaves, and neurofeedback training for psychotherapists and other newcomers interested in the field. Forty years after Eugene Peniston’s publications, Alpha-Theta Neurofeedback in the 21st Century is the first comprehensive guide in this clinical area.