Scalp-Recorded Electrical Activity
How the brain's electrical activity, filtered and blurred by the tissue between it and the scalp, still carries a detectable signal at the whole-brain scale.
References
- Berger, H. "Über das Elektrenkephalogramm des Menschen." Archiv für Psychiatrie und Nervenkrankheiten 87, no. 1 (1929): 527–570.