This book provides eloquent support for the idea that spontaneous neuron activity, far from being mere noise, is actually the source of our cognitive abilities. It takes a fresh look at the co-evolution of structure and function in the mammalian brain, illustrating how self-emerged oscillatory timing is the brain's fundamental organiser of neuronal information. In a sequence of cycles, György Buzsáki guides the reader from the physics of oscillations through neuronal assembly organisation to complex cognitive processing and memory storage. This volume is essential reading for anyone interested in our rapidly evolving understanding of the brain.