Front. Public Health, 23 December 2021 | https://doi.org/10.3389/fpubh.2021.788613

AUTHOR=Foster Kenneth R., Garrett David C., Ziskin Marvin C.

TITLE=Can the Microwave Auditory Effect Be “Weaponized”?

JOURNAL=Frontiers in Public Health

VOLUME=9

YEAR=2021

PAGES=2142

URL=https://www.frontiersin.org/article/10.3389/fpubh.2021.788613

DOI=10.3389/fpubh.2021.788613

ISSN=2296-2565

Introduction

Brief but intense pulses of radiofrequency (RF) energy can elicit auditory sensations when absorbed in the head of an individual, an effect known as the microwave auditory or “Frey effect” after the first investigator to examine the phenomenon (1). The effect is known to arise from thermoacoustically (TA)-induced acoustic waves in the head (2).

Lin has proposed that the Frey effect may be linked to unexplained health problems reported by U.S. officers in Cuba and elsewhere, the so-called Havana syndrome (3). The failure to detect microwave exposure to the affected individuals lends no support to this hypothesis, and we do not speculate about the cause of the symptoms. The question remains: whether the auditory effect can be “weaponized,” i.e., used to harass or harm an individual. For reasons of effect size and practicality this appears unlikely, but the lack of publicly available information about existing high power RF technology and uncertainties about thresholds for adverse effects does not allow full resolution of the matter.

Read the complete article at https://www.frontiersin.org/articles/10.3389/fpubh.2021.788613/full

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https://theconversation.com/scientists-suggest-us-embassies-were-hit-with-high-power-microwaves-heres-how-the-weapons-work-151730

Excerpt

Lots of power, little heat

Although these high-power microwave sources generate very high power levels, they tend to generate repeated short pulses. For example, the SINUS-6 in my lab produces an output pulse on the order of 10 nanoseconds, or billionths of a second. So even when generating 1 gigawatt of output power, a 10-nanosecond pulse has an energy content of only 10 joules. To put this in perspective, the average microwave oven in one second generates 1 kilojoule, or thousand joules of energy. It typically takes about 4 minutes to boil a cup of water, which corresponds to 240 kilojoules of energy.

This is why microwaves generated by these high-power microwave weapons don’t generate noticeable amounts of heat, let alone cause people to explode like baked potatoes in microwave ovens.

The University of New Mexico has a graduate program in directed energy microwaves (HPM)

http://ece-research.unm.edu/de-microwaves/index.html

Background:

The post December 2020: more on the Havana Syndrome appeared first on EMFSA.

PMCID: PMC7199630PMID: 32411067

Abstract

Objective: We aim to examine the existing literature on, and identify knowledge gaps in, the study of adverse animal and human audiovestibular effects from exposure to acoustic or electromagnetic waves that are outside of conventional human hearing.

Design/Setting/Participants: A review was performed, which included searches of relevant MeSH terms using PubMed, Embase, and Scopus. Primary outcomes included documented auditory and/or vestibular signs or symptoms in animals or humans exposed to infrasound, ultrasound, radiofrequency, and magnetic resonance imaging. The references of these articles were then reviewed in order to identify primary sources and literature not captured by electronic search databases.

Results: Infrasound and ultrasound acoustic waves have been described in the literature to result in audiovestibular symptomology following exposure. Technology emitting infrasound such as wind turbines and rocket engines have produced isolated reports of vestibular symptoms, including dizziness and nausea and auditory complaints, such as tinnitus following exposure. Occupational exposure to both low frequency and high frequency ultrasound has resulted in reports of wide-ranging audiovestibular symptoms, with less robust evidence of symptomology following modern-day exposure via new technology such as remote controls, automated door openers, and wireless phone chargers. Radiofrequency exposure has been linked to both auditory and vestibular dysfunction in animal models, with additional historical evidence of human audiovestibular disturbance following unquantifiable exposure. While several theories, such as the cavitation theory, have been postulated as a cause for symptomology, there is extremely limited knowledge of the pathophysiology behind the adverse effects that particular exposure frequencies, intensities, and durations have on animals and humans. This has created a knowledge gap in which much of our understanding is derived from retrospective examination of patients who develop symptoms after postulated exposures.

Conclusion and Relevance: Evidence for adverse human audiovestibular symptomology following exposure to acoustic waves and electromagnetic energy outside the spectrum of human hearing is largely rooted in case series or small cohort studies. Further research on the pathogenesis of audiovestibular dysfunction following acoustic exposure to these frequencies is critical to understand reported symptoms.

The full study is available at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7199630/

The authors discuss:

•Infrasound (0.1–20 Hz)

Infrasound Characteristics and Perception by Humans

Audiovestibular Symptoms Following Infrasound Exposure

•Wind Turbine Syndrome

•Audible Sound (20–20,000 Hz)

Human Perception of Audible Sound

Audible Sound as a Human Deterrent

•Low Frequency Ultrasound (17.8 kHz−2 mHz)

Ultrasound Wave Characteristics

Historical Evidence of Audiovestibular Dysfunction Following Ultrasound Exposure

Ultrasound Exposure From Consumer Devices

Proposed Mechanisms for Audiovestibular Disturbance

•Radiofrequency (3 kHz−300 GHz) and Microwaves (1–30 GHz)

Electromagnetic Wave Properties

Radiofrequency Hearing and the “Frey Effect”

Historical Data on RF Exposure From Eastern Europe in the Mid 1900s

Animal and Human Studies Following RF Exposure Produced Varied Symptoms

Historical Evidence of Human Audiovestibular Disturbance Following Exposure

•Magnetic Resonance Imaging

Isolated Reports of Auditory Symptoms Following Clinical MRI Exposure

Vestibular Disturbances Following MRI Exposure in Animal Models and Humans

•Limitations and Conclusions

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