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Whitman JC, Ward LM, Woodward TS (2013) Patterns of cortical oscillations organize neural activity into whole-brain functional networks evident in MRI BOLD signal. Front Hum Neurosci 7 The equivalences of the energies from electromagnetic and mechanical sources indicate convergence or compliment of their individual effects when they are presented simultaneously. From the perspective of parsimony, both electromagnetic and mechanical energies are the expression of the “same” entity. Their concurrence is escalating in the cultural environment. For example, sound from music presented by devices placed into the ear canals (as opposed to listening to music from distant speakers or instruments propagating waves through air) is also associated with a concomitant magnetic field. Salt AN, Hullar TE (2010) Responses of the ear to low frequency sounds, infrasound and wind turbines. Hear Res 268:12–21 Evces CR, McElhaney JH (1971) Some effects of drugs on the low frequency whole body vibration of dogs. Aerospace Med 42(4):416–428
Infrasound wavelengths can be generated artificially through detonations and other human activity, or naturally from earthquakes, severe weather, lightning, and other sources. [69] Like forensic seismology, algorithms and other filter techniques are required to analyze gathered data and characterize events to determine if a nuclear detonation has actually occurred. Data is transmitted from each station via secure communication links for further analysis. A digital signature is also embedded in the data sent from each station to verify if the data is authentic. [71] Detection and measurement [ edit ] Von Muggenthaler, E., Perera, D. (2002), The cat's purr: a healing mechanism?, In review, presented 142nd Acoustical Society of America International Conference, 2001. The pressure fluctuations within the volume of the rat brain (2.5 × 10 −6 m 3) would be energetically similar to 10 −5 J. With approximately 10 9 equivalent cell volumes within a 2.5 cc brain, this would mean that ~10 −14 J from this energy would be available per cell. This is within the range of metabolic energy associated with glucose metabolism (10 −12 J s −1). The argument that the numbers of neurons that could be affected is minimal compared to the total numbers of neurons in the rat brain may not be valid in light of more recent discoveries that the experimental stimulation of only one neuron can affect behavioral responses in a detection task (Houweling and Brecht 2007) and can modify the global state of the cortical manifold (Li et al. 2009). W. John Richardson; Charles R. Greene, Jr.; Charles I. Malme; Denis H. Thomson (1995). Marine Mammals and Noise. Academic Press. ISBN 978-0-12-588440-2. Berns GS, Cohen JD, Mintun MA (1997) Brain regions responsiveness to novelty in the absence of awareness. Science 276:1272–1275Persinger MA (1993) Personality changes following brain injury as a grief response to the loss of sense of self: phenomenological themes as indices of local lability and neurocognitive structuring as psychotherapy. Psychol Rep 72:1059–1068 From about 1000Hz, the dynamic range of the auditory system decreases with decreasing frequency. This compression is observable in the equal-loudness-level contours, and it implies that even a slight increase in level can change the perceived loudness from barely audible to loud. Combined with the natural spread in thresholds within a population, its effect may be that a very low-frequency sound which is inaudible to some people may be loud to others.
On 31 May 2003, a group of UK researchers held a mass experiment, where they exposed some 700 people to music laced with soft 17Hz sine waves played at a level described as "near the edge of hearing", produced by an extra-long-stroke subwoofer mounted two-thirds of the way from the end of a seven-meter-long plastic sewer pipe. The experimental concert (entitled Infrasonic) took place in the Purcell Room over the course of two performances, each consisting of four musical pieces. Two of the pieces in each concert had 17Hz tones played underneath. [60] [61]
Persinger MA (2012) Brain electromagnetic activity and lightning: potentially congruent scale-invariant quantitative properties. Front Integr Neurosci 6(19):1–10 Holz EM, Glennon M, Prendergast K, Sauseng P (2010) Theta-gamma phase synchronization during memory matching in visual working memory. NeuroImage 52:326–335
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