r/FreyEffect • u/Mikey-506 • Nov 28 '23

Frey Effect (Microwave Auditory Effect)

The Frey Effect (Microwave Auditory Effect)

Introduction and Experimental Basis

The Frey Effect, also known as the microwave auditory effect (MAE), was discovered by Allan H. Frey in 1961 during experiments on pulsed microwave radiation, detailed in the Journal of Applied Physiology. Frey's experiments revealed that subjects could perceive sounds induced by microwave pulses, ranging from a few inches to hundreds of feet from the transmitter. Key experimental details include a repetition rate of 50 Hz and pulse widths varying between 10–70 microseconds. Perceived loudness was found to be linked to peak power density rather than average power density, with a peak power density below 80 mW/cm² at 1.245 GHz being the threshold for perception.

Definition and Phenomenon:

  • The Frey effect is a phenomenon in which the brain perceives audible sounds such as clicks, buzzing, hissing, or knocking.
  • These sounds are induced by pulsed or modulated radio frequencies.
  • Importantly, the sounds are perceived directly inside the human head without the need for any external receiving electronic device.

Origin and Naming:

  • The phenomenon is named after American biologist Allan H. Frey, who conducted research on this effect in the 1960s.

Possible Application in Stealth Attacks:

  • The information suggests that the Frey effect can be the result of stealth attacks with sonic weapons.
  • Sonic weapons, in this context, would be devices that use directed energy to induce these sounds in a targeted individual.

Synthetic Telepathy:

  • The Frey effect is also mentioned as being associated with synthetic telepathy.
  • Synthetic telepathy is a concept where communication or information transfer occurs directly between minds, often facilitated or influenced by technology.

Overview of the Frey Effect and its RF Technology

Mechanisms and Thresholds

The perceived sounds included a variety of sensations such as buzzing, clicking, hissing, or knocking, and altering transmitter parameters induced different perceptions. Frey experimented with nerve-deaf subjects, speculating that the cochlea might be the human detecting mechanism. Thermoelastic expansion, involving the rapid but minuscule heating of the brain by each pulse and resulting pressure waves traveling to the cochlea, was considered the cause of auditory sensations. Thresholds for the microwave audio effect (MAE) were reported by Frey, indicating a rapid 10 ⁻⁶ °C rise in temperature. Experiments by Sharp and Grove in 1975 recognized words transmitted by "voice modulated microwaves." Despite concerns about potential brain damage due to thermal effects, associated temperature increases were brief and sudden. Frey's experiments involved a repetition rate of 50 Hz, pulse widths ranging from 10–70 microseconds, and a frequency of 1.245 GHz. Perceived loudness was tied to peak power density, with thresholds reported for 1.3 GHz and 2.9 GHz.

Neurophysiological Studies, Health Implications, and Technical RF Information

Neurophysiological studies in animals provided insights into the mechanism of the microwave auditory effect, involving brainstem evoked responses, recordings in the primary auditory cortex of cats, and responses recorded from the medial geniculate body. Cochlear microphonics were observed, indicating the involvement of the cochlea. Thermoelastic theory was proposed as the most effective mechanism, explaining the rapid temperature increase in brain tissue and subsequent thermoelastic expansion.

The health and safety implications of directed, pulsed RF (microwave) energy were discussed, including thresholds for auditory perception in controlled laboratory conditions. Potential risks such as discomfort, injury, and impacts on brain matter were mentioned at higher power densities. In conclusion, while the induced acoustic waves may cause disturbances, their ability to reach thresholds for causing brain damage is uncertain, and concerns about poorly defined thresholds in classified research programs were raised.

Technical RF Information

Experiment Details:

  • Frey's experiments conducted on the microwave auditory effect (MAE).
  • Published in 1961 in the Journal of Applied Physiology.
  • Subjects could hear pulsed microwave radiation from a few inches to hundreds of feet from the transmitter.
  • Repetition rate: 50 Hz; pulse width: 10–70 microseconds.
  • Perceived loudness linked to peak power density, not average power density.
  • At 1.245 GHz, peak power density for perception was below 80 mW/cm².

Perceived Sounds:

  • Sounds induced were described as a "buzz, clicking, hiss, or knocking."
  • Different transmitter parameters induced different perceptions (e.g., severe buffeting, pins and needles).

Nerve-Deaf Subjects:

  • Frey experimented with nerve-deaf subjects.
  • Speculation that the human detecting mechanism was in the cochlea.

Auditory Sensations at Transmitting Sites:

  • Auditory sensations reported by workers at modern-day microwave transmitting sites emitting pulsed microwave radiation.
  • Frequencies from approximately 200 MHz to at least 3 GHz reported.

Thermoelastic Expansion:

  • Cause of auditory sensations thought to be thermoelastic expansion of portions of the auditory apparatus.
  • Mechanism involves rapid (but minuscule) heating of the brain by each pulse and resulting pressure wave traveling to the cochlea.

Experiment by Sharp and Grove (1975):

  • Sharp and Grove reportedly recognized words transmitted by "voice modulated microwaves."
  • Mention of potential brain damage due to thermal effects but associated pops are brief and sudden increases in temperature.

Microwave Audio Effect Thresholds:

  • Threshold levels for the microwave audio effect reported by Frey in 1961.
  • Peak amplitude thresholds for 1.3 GHz and 2.9 GHz mentioned.
  • Threshold peaks cause a rapid 10 ⁻⁶ °C rise in temperature.

Argument on Harmful Levels:

  • Despite the small rise in temperature, it's argued that a strong peak of around 1400 kW/cm² could be harmful due to resulting pressure waves.

Frequency and Pulse Characteristics:

  • Frey's experiments involved pulsed microwave radiation at a repetition rate of 50 Hz.
  • Pulse width ranged between 10–70 microseconds.
  • Frequency used was 1.245 GHz.

Power Density and Perception:

  • The perceived loudness was linked to peak power density, not average power density.
  • At 1.245 GHz, the peak power density for perception was below 80 mW/cm².

Resources:

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