Preliminary notice: High frequency emissions, from         PC-LCD and TV-CRT screens, were received in the human head, and modulated into irregular patterns.

Zamir P. Shalita 

Consultant on electromagnetic hazards. 3 Hashoshan Str. Ramat Gan Israel.

The emissions of a PC-LCD screen (at 0.7 m), and a TV-CRT (at 1.0 m) were studied at background of 0.004 mW/cm2, at office desk. When both PC and TV set, were off, typical readings from air were unstable at 50 - 80 Hz,  and from a human forehead, they were read at  400 - 430 Hz. The PC-LCD screen emissions were read at ~ 470 kHz,  while TV-CRT emissions were read, at       14 - 16 kHz.  When  only PC was on, readings  at desk, were at  55 - 70 Hz, and readings from head reached  275 - 290 kHz.  When only TV was on, readings from air were at 55 - 70  Hz while 10 - 14 kHz were read from head. When both TV and PC were on, typical readings at seat, were at about              40 - 60 Hz,  from air, and 115 - 150 kHz from the head.                          .              These preliminary observations, may indicate that at 'safe' office or domestic background, the high frequency emissions of both screens were well received in the human head, where they were modulated into irregular unstable patterns. The average frequency read from the head, when both PC and TV were on, may indicate of partial interference  at point of measurement.        The frequency modulation of screens' emissions absorbed in the head, may resemble in some extent, the irregular character of natural brain ELF waves, but their patterns did not look alike. The present evidence of screen emissions, that were absorbed and modulated in the head, may help to explain how external high frequency emissions, may interfere with normal brain electric signals, and caused the severe symptoms experienced by electromagnetic hypersensitive individuals.  This study is in progress.