Nervous system manipulation by electromagnetic fields from monitors (computer +).

US Patent US6506148B2

Physiological effects have been observed in a human subject in response to stimulation of the skin with weak electromagnetic fields that are pulsed with certain frequencies near ½ Hz or 2.4 Hz, such as to excite a sensory resonance. Many computer monitors and TV tubes, when displaying pulsed images, emit pulsed electromagnetic fields of sufficient amplitudes to cause such excitation.

https://patents.google.com/patent/US6506148B2/en