The following video is really worth taking the time to watch.
It explains clearly how very low frequency sound waves (infrasound) from wind turbines have an adverse effect on some people, making them feel ill.
Like the motion sickness that people experience in a car, plane or boat, infrasound sickness results from “sensory conflict” in the central nervous system (CNS).
Hat-tip: Wolfgang Neumann at FB.
Sensory conflict is when two or more of your senses disagree with each other with respect to your own personal motion. For example when on a boat the inner ear and the sense of touch perceive motion, but your visual system does not. This “sensory conflict” can make some people get ill.
The middle ear and touch of course sense motion by detecting changes in pressure. When you walk, for example, your head bobs up and down, and moves back and forth in rhythm, and the inner ear registers the pressure changes of -0.12 Pa to +0.12 Pa as the head accelerates and decelerates. Your feet (touch) sense the pressure changes, and your eyes perceive the motion as well – so everything agrees and so you do not get sick.
The problem with wind turbines is that they create low frequency infrasound with a frequency of under 20 Hz, which is a cyclic barometric pressure change in the air that gets sub-consciously registered by the inner ear. As a result the brain is fooled into thinking that the body is in motion, when in fact it is not. Sensory conflict is the result and it leads some people to feel ill.
Known back in 1985
Scientific tests confirm the phenomenon: some people are sensitive to infrasound and the sickness linked to wind turbines is real. In 1985 psychology professor David Nussbaum at NASA exposed people to infrasound in an enclosed cabin for 30 minutes as part of an experiment. The result: 15% of the people felt the onset of motion sickness. Now imagine being subjected to the low frequency non-stop for days, which can be the case for wind turbines. Little wonder that some people get extremely sick.
It turns out that the tested subjects responded to the steady, symmetrical waves, and not the random-type asymmetrical waves (see 8-minute mark). Wind generators produce constant symmetrical waves. And the bigger the turbine, the more powerful the infrasound wave. Yet today a number of government officials and green activists refuse to acknowledge these well-known findings and ignore the impacts wind parks are having on the health of people living near them. They continue permitting their installation.
And let’s also not forget the blighted landscape they create.