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microwave hearing (Frey effect), especially voice modulation

Allen L. Barker alb at datafilter.com
Sat May 11 17:19:34 EST 2002

There is a great deal more information on microwave hearing (the Frey
effect) on the web now than there was even just a couple of years ago.
At the bottom of this article I have included a list of some of the
quality material now available.  I have focused on the
voice-modulation aspect, whereby an audio signal can be modulated onto
the microwave carrier and subsequently perceived as the original sound
"in the head" of a person illuminated with the microwave radiation.

Nonetheless, full answers to questions such as the following -- as far
as I know -- are not known in the open literature:

-- Do *individuals* vary widely in their sensitivity to the effect?
What power levels affect the most sensitive people?

-- How do different variables affect an individual's sensitivity to
the effect?  Are there ways it can be increased?  Would initial
harassment and resulting PTSD have any effect on it?  Chemicals?
Electromagnetic exposure?  Age?  Etc.

-- How do microwave parameters (such as pulse rate) for peak effect
vary for different people?  (Some mathematical models vary according
to head size, as one variable.)

-- What is the subliminal threshold for any effect?  Is it below
the conscious hearing level?

-- Are there other low-power effects which can cause subjectively
similar results (such as "voices") in humans?

These sorts of questions are important just for their potential
relevance to the health of people in an environment full of

It would not be that difficult to construct a test of the effect that
people could take like a hearing test.  It would just require some
market for the machine (homemade devices may be dangerous) and a
medical recognition of the effect.

If such devices and practitioners were available, then people
reporting related symptoms could be tested, if only to find out the
relevant data.  They could also get an idea of what such voices sound
like and "seem like" subjectively and compare them to what they

The effects mind control victims report might be related to the Frey
effect or might not.  Specifically, among true victims, some may be
assaulted with microwave-hearing-based weapons but others are
assaulted with different technology or techniques.

Effects such as microwave hearing might be used at a later stage to
actually dismiss victims, by people claiming it was all electrical
sensitivity or it was *all* harassment with microwave-hearing-based
devices.  But what is new?  Mind control victims know it is always
something with the torturers, always some distraction or
rationalization, anything but that they are victims of domestic
torture operations.  Don't forget the known and documented mind
control victims who are still ignored and ridiculed, and secret
research projects like PANDORA set up specifically to test microwave
effects on human behavior.  How many domestic torture victims further
persecuted as "schizophrenics" by supposed healers are too many?  The
Soviets had a term, "sluggish schizophrenia," for people crazy enough
to challenge the totalitarian state.

------  References on the web, with excerpts.  ---------

[Frey's original 1962 paper.]

[An SBIR contract on "Communicating Via the Microwave Auditory Effect"]

      An innovative and revolutionary technology is described that offers a
      means of low-probability-of-intercept Radio frequency (RF)
      communications. The feasibility of the concept has been established
      using both a low intensity laboratory system and a high power RF
      transmitter. Numerous military applications exist in areas of search
      and rescue, security and special operations.

[A recent paper by Lin, with references esp. to pitch of perceived signal.]

[Abstract of a NASA technical report, very direct about the applications.] 

      A decoy and deception concept presently being considered is to
      remotely create the perception of noise in the heads of personnel by
      exposing them to low power, pulsed microwaves. When people are
      illuminated with properly modulated low power microwaves the sensation
      is reported as a buzzing, clicking, or hissing which seems to
      originate (regardless of the person's position in the field) within or
      just behind the head. The phenomena occurs at average power densities
      as low as microwatts per square centimeter with carrier frequencies
      from 0.4 to 3.0 GHz. By proper choice of pulse characteristics,
      intelligible speech may be created. Before this technique may be
      extended and used for military applications, an understanding of the
      basic principles must be developed. Such an understanding is not only
      required to optimize the use of the concept for camouflage, decoy and
      deception operations but is required to properly assess safety factors
      of such microwave exposure.

[An email from Alan Frey, a long-time researcher in microwave hearing.]

      There is a microwave hearing effect that occurs at very low power 
      densities and a skull vibration effect that occurs when very high energies are 
      applied to the head.  There is some confusion in the literature because the
      vibration effect has often been referred to as a microwave hearing effect,
      but it is not the same phenomena.

[A Navy publication reprinted at John Pike's web site.  He was formerly with FAS.]

      Inside The Navy
      March 26, 2001
      Vol. 14, No. 12
      Pg. 1
      (Reprinted with permission) 
      Questions Linger About Health Effects Of DOD's 'Non-Lethal' Ray
      by Christopher J. Castelli, Chief Editor 
      Though U.S. military proponents of the non-lethal ray say they
      worry the public will get the wrong idea about the technology, the Air
      Force's own "New World Vistas" report, published in the mid 1990s,
      actually describes goals of using electromagnetic radiation for what
      sounds like mind control.
      "It would also appear possible to create high fidelity speech in the
      human body, raising the possibility of covert suggestion and
      psychological direction. When a high power microwave pulse in the
      gigahertz range strikes the human body, a very small temperature
      perturbation occurs. This is associated with a sudden expansion of the
      slightly heated tissue," states the report. "This expansion is fast
      enough to produce an acoustic wave. If a pulse stream is used, it
      should be possible to create an internal acoustic field in the 5-15
      kilohertz range, which is audible. Thus it may be possible to 'talk'
      to selected adversaries in a fashion that would be most disturbing to
      them." This appears to be a reference to the "microwave hearing
      effect," a scientific phenomena Frey is credited with discovering in
      the 1960s.
      Hackett said the non-lethal MMW ray project is not seeking to create
      that kind of talking effect in people's heads.
      In fact, Frey and Hackett said the microwave hearing effect does not
      occur with millimeter waves (which range from 3 to 300 GHz).
      "On the other hand, if your millimeter waves have enough energy
      density, are powerful enough, there are other phenomena where you
      could cause sort of a concussion kind of effect which could
      conceivably be heard by bone conduction. It would transfer through
      skin to bone and bone into the inner ear," Frey said. He said it might
      be possible to modulate such energy to create the perception of some
      intelligible sounds. "But off hand, I can't tell you what kind of
      power levels you might need to do that," he said. Hackett dismissed
      the idea of transmitting intelligible sounds to the head with MMWs as
      pure speculation.


[An OSHA slide presentation on general microwave health effects.]

[Excerpts from a book(?) on biological effects of non-ionizing radiation.]

      Selected excerpts to      
      Biological Effects of Radiofrequenzy Radiation (revised2.February1996 )     
      cut/condensed from Biological Effects of Radiofrequency and Microwave
      Radiation: Application, Hazards, and Safeguards.  by Wolfgang
      W. Scherer( 25. March 1994 )
      ..... A special role is played by
      the electrophonic effect of microwave hearing. Humans can perceive a
      buzzing or clicking sound in the back of their heads at exposure to
      power densities as low as 0.1 mW/cm² of pulsed microwave radiation
      (200-3000 MHz) , depending on the pulse repetition frequency and the
      peak power density (around 300 mW/cm²). The absorbed energy produces a
      thermoelastic expansion of the brain tissue causing an acoustic
      pressure wave which is detected in the cochlea by the hair cells of
      the organ of Corti. The energy needed to produce this effect is so
      small that it does not actually increase the mean temperature of the
      brain, yet the acoustic sensation is strong enough to be clearly
      perceived in an ambient noise level of circa 65 dB. Due to this fact
      microwave hearing does not cause an apparent physical reaction within
      the head, but it is well known that humans suffer general stress
      reactions when they are exposed to higher levels of sound. Noise
      cannot only be an annoyance, but when it consists of pulsed sounds it
      affects heart beat and metabolic rates. [8] The subliminal aspects of
      noise levels are here not even considered despite the recognized
      physiological effects of acoustic noise. It would be a very
      interesting field for research to probe the subliminal acoustic
      effects of such exposure to low radio frequency radiation. A possible
      link between such radiation and noise related reactions , effects, or
      damages would be an aspect worth of further investigation......

["Radio Frequency Radiation (RFR) Bio-Effects Research in the Pan-Pacific Area"]

      Relatively high-intensity RF fields have been shown to cause adverse
      health consequences by heating tissues. No adverse health effects have
      been scientifically confirmed from exposure to low-level RF fields for
      extended periods, but certain questions have not been thoroughly
      studied. There is very little information available in the scientific
      literature to assess any health risks from exposure to pulsed RF
      fields. Studies are needed that seek to identify any biological
      effects produced by pulsed RF fields, of both high and low peak pulse
      intensities. Examples of current and future technologies using pulsed
      RF fields are telecommunications, civilian and military radar systems,
      including emerging radar technology such as ultra-wide band radars and
      anti-electronic weapons. Current and future research applicable to
      mobile telephone systems should focus on the 900-2000 MHz frequency
      range and appropriate pulsing and modulation patterns.

[Justensen's article online, first published mention of speech-modulated microwave.]

      By radiating themselves with these "voice modulated" microwaves, Sharp
      and Grove were readily able to hear, identify, and distinguish among
      the 9 words. The sounds heard were not unlike those emitted by persons
      with artificial larynxes. Communication of more complex words and of
      sentences was not attempted because the averaged densities of energy
      required to transmit longer messages would approach the current 10
      mW/cm2 limit of safe exposure.

[Also search at the U.S. Patent Office]

Mind Control: TT&P ==> http://www.datafilter.com/mc
Allen Barker

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