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"Bruel and Olesen (1973) found that artificial generation of infrasound around 12 Hz within the 85–110 db range elicited ill-feelings within a few seconds in several people. While infrasound pressures between 115 and 120 db generated between 1 and 20 Hz did not produce visual anomalies during routine test-taking behaviors, there was a 30–40 % increase in reaction time as well as the sensation of lethargy (Evans and Tempest 1972). Application of whole-body vibrations from vertically applied sinusoidal variations displays maximum transmissibility around 5–6 Hz with a range between about 3 and 7 Hz (Stephens 1969). The frequency band with specific effects can be quite narrow. For example, sensations reported as body movements occurred in about one-third of volunteers exposed to 5–10 Hz vibrations, whereas visual effects were more prominent at 12, 14, and 19 Hz. Tingling sensations were evident around 32 Hz."
Sept. 7, 2003, 11:41 AM EDT / Source: The Associated Press Mysteriously snuffed out candles, weird sensations and shivers down the spine may not be due to the presence of ghosts in haunted houses but to very low frequency sound that is inaudible to humans. British scientists have shown in a controlled experiment that the extreme bass sound known as infrasound produces a range of bizarre effects in people including anxiety, extreme sorrow and chills — supporting popular suggestions of a link between infrasound and strange sensations. “NORMALLY YOU can’t hear it,” Richard Lord, an acoustic scientist at the National Physical Laboratory in England who worked on the project, said Monday. Lord and his colleagues, who produced infrasound with a 23-foot (7-meter) pipe and tested its impact on 750 people at a concert, said infrasound is also generated by natural phenomena. “Some scientists have suggested that this level of sound may be present at some allegedly haunted sites and so cause people to have odd sensations that they attribute to a ghost — our findings support these ideas,” said Professor Richard Wiseman, a psychologist at the University of Hertfordshire in southern England.
Palinopsia
Negative and positive afterimages are a natural part of human vision. But rarely, an underlying condition causes people to see more afterimages or similar visual sensations.
These are part of a group of symptoms called palinopsia. There are two types: Hallucinatory and illusory palinopsia.
People with palinopsia can experience intense positive afterimages in response to light or movement. These images tend to last much longer than normal afterimages.
If you start to notice more intense, longer lasting afterimages, schedule an appointment with an eye doctor.
Note the heaters, especially the infrared heaters that you use at home, come under the category of infrared waves as they generate thermal energy. They are extensively used in law enforcement, scientific, industrial, medical applications, and the military. Along with this, these waves are used massively for civilian and military applications such as surveillance, target acquisition, homing, tracking, and night vision.
A Russian defense company has created a “cloak,” which it says can make electronic objects invisible to enemy radar. The aim of the fiber technology, which is used in the cloak, is to make weapons invisible to prying eyes and detection systems.
The St. Petersburg-based company Roselectronics has come up with the invention and says it can make weapons that use thermal, infrared, and electromagnetic radar in targeting invisible.
“The main idea of the development is to create coverage that reduces radar visibility of the object both on the visible and microwave spectrums,” Georgy Medovnikov from Roselectronics told Ruptly, RT’s video agency.
Infrasound is radiated by a variety of geophysical processes including earthquakes, severe weather, volcanic activity, geomagnetic activity, ocean waves, avalanches, turbulence aloft, and meteors.
[psl.noaa.gov...]
December 12, 2013 - Infrasound sources from the natural environment originate from winds, microbaroms, geomagnetic activity, and microseisms and can propagate for millions of meters. Cultural sources originate from air moving through duct systems within buildings, large machinery, and more recently, wind turbines.
[link.springer.com...]
Recent interest in the potential adverse human health effects of infrasound (generally inaudible sound with a
frequency of
originally posted by: quintessentone
1. A dacha is a cottage, so I'm assuming he was heating it with a wood burning fire? Could hallucinogenic gases be at play here?
2. He was writing a manuscript - writers sometimes get lost in their works and don't sleep - sleep deprivation = hallucinations. Also he mentions sunlight, so was it early morning, did he stay up all night writing?
3. Time of day? He mentions sunlight, so could sunlight be somehow a part of the light play outside? Also was he gazing into the fire for long periods of time, this may be explained as 'afterimage' and a more severe case is known as Palinopsia -
4. Kusov guessed that the infrasound radiation was low level but we really don't know the levels it may have been. Infrared waves are part of the electromagnetic radiation spectrum and include heat inducing properties, such as in heating the brain which may cause issues. There is so much more to learn about exposure and what constitutes a safe low level. We may be able to debunk the 'black hole' he witnessed as the point where the light was being collected(?) perhaps in a military night vision experiment?
Though the science sounds incredible, Eichar believes it is the only logical explanation for the situation in which the bodies were found. Although Dead Mountain is so remote and inaccessible that the weather phenomenon cannot be directly observed there in the winter, it has been observed in similarly-shaped locations, including the rock of Gibraltar and an array of other peaks. In the right conditions, a flow of wind can be directed in such a way that it creates a vortex. These vortices are created in sequences by the moving air, and travel away in a fan shape. With sufficiently high winds and the correct angles, these vortices of wind could form powerful tornadoes, with the potential to emit large amounts of infra-sound, as well as cause damage by themselves. Eichar's theory supposes that the Dyatlov hikers' tent was directly downwind from the peak of the mountain, and far enough away that the whirling winds themselves did not strike the tent. But they would have been close enough for the effects to be felt – and heard.