US Patent 3,951,134 Apparatus and Method for Remotely Monitoring and Altering Brain Waves
This patent was filed August 5, 1974 by inventor Robert G. Malech of Plainview, NY. The patent itself describes a method to monitor and activate brain activity using directed electromagnetic radiation without the use of local sensors. It indicates that by altering the scan angle and direction of the antennas any region of the brain can be targeted. Since the patent was granted April 20, 1976 it is likely that the spatial resolution and decoding capabilities were minimal at best as the computational resources requisite for such operation, outside the classified realm, were limited at this time.
see more: https://remoteneuroimaging.blogspot.com/2010/09/us-patent-3951134-apparatus-and-method.html?m=1&fbclid=IwAR2F_dZd4wvcI5JfWvcFBDb57QcKKifRjAEQ-bTwy6Ga0iYXZ9ER-E_kFhU