The resilient electroencephalograph (EEG) offers unique insight into real-time, otherwise ethereal operations of the cortex. The diagnostic potency of the EEG within healthcare has maintained its punch across technological advancements through the many years since it first emerged, evidencing resilience, adaptability, and evolution. In addition to being the gold standard for determining whether concerning clinical episodes are due to epileptic seizures or some other etiology, the EEG offers insight including determining if a patient is having seizures without any accompanying clinical features (nonclinical seizures) as well as offering functional context for why a patient may be mentally altered. The tentacles of the EEG reach out expansively and deeply within neurological diagnostics. Deviations from EEG developmental milestones in young children imply structural injury to the cortex, generalized background slowing implies an encephalopathy, and focal slowing implies a focal dysfunction of the cortex. The EEG can also rapidly - within seconds - capture changes secondary to cerebral hypoperfusion. While modern medicine has immeasurably benefitted from the implementation of the CT and MRI scans, such radiological modalities are confined to surveying structure and thus are inherently distanced from observing the metabolic aspects of the cortex. Buoyed by a plethora of actual EEG examples representing a wide range of EEG waveform patterns and findings, this book will serve well those with the desire to both learn of the EEG's value and influence as well as those looking for a comprehensive educational source on EEG. The original niche carved out by EEG endures to this day. Its unique ability to peer into the cortex's otherwise concealed processes effectively exemplifies a sui generis contribution to healthcare.