Effect of low-frequency magnetic fields on brain electrical activity in human subjects

2004 ◽  
Vol 115 (5) ◽  
pp. 1195-1201 ◽  
Author(s):  
Andrew A Marino ◽  
Erik Nilsen ◽  
Andrew L Chesson ◽  
Clifton Frilot
1965 ◽  
Vol 8 (4) ◽  
pp. 371-387 ◽  
Author(s):  
Donald C. Teas

Electrical activity at two locations on the scalp (Vertex and Vertex-3 cm, midline) for an experimental design suitable to clinical application, was recorded on magnetic tape. Data from 5 subjects with normal hearing, for 3 testing days, were processed. Average evoked responses to bursts of wide-band noise (30 dB and 50 dB SL) for two conditions (“eyes closed” and “reading”) were computed. The ongoing background activity was processed by computing its interval histogram. The percentage of ongoing activity within the frequency range 1.5 cps to 17 cps was extracted, and the magnitude of the N 1 -P 2 component of average responses was measured. These measures at the two electrode sites were analyzed by calculating analyses of variance for each of the four sets of data. Percentage of low-frequency background activity and N 1 -P 2 magnitude were positively related only for Day 1. A strong habituation effect appeared for Day 2 and Day 3. Habituation reduced differences between the two conditions and also differences between the two signal strengths for the average responses. Maximum N 1 -P 2 magnitude should be recorded for a single test with the subject relaxed and with his “eyes closed.” For repeated testing a discrimination between signals should be required to offset the attenuation of responses by habituation.


1995 ◽  
Vol 7 (2) ◽  
pp. 82-88 ◽  
Author(s):  
William E. Hoffman ◽  
Fady T. Charbel ◽  
Guy Edelman ◽  
Ronald F. Albrecht ◽  
James I. Ausman

Author(s):  
P. A. Marsh ◽  
T. Mullens ◽  
D. Price

It is possible to exceed the guaranteed resolution on most electron microscopes by careful attention to microscope parameters essential for high resolution work. While our experience is related to a Philips EM-200, we hope that some of these comments will apply to all electron microscopes.The first considerations are vibration and magnetic fields. These are usually measured at the pre-installation survey and must be within specifications. It has been our experience, however, that these factors can be greatly influenced by the new facilities and therefore must be rechecked after the installation is completed. The relationship between the resolving power of an EM-200 and the maximum tolerable low frequency interference fields in milli-Oerstedt is 10 Å - 1.9, 8 Å - 1.4, 6 Å - 0.8.


2014 ◽  
Vol 19 (5) ◽  
pp. 3-12
Author(s):  
Lorne Direnfeld ◽  
David B. Torrey ◽  
Jim Black ◽  
LuAnn Haley ◽  
Christopher R. Brigham

Abstract When an individual falls due to a nonwork-related episode of dizziness, hits their head and sustains injury, do workers’ compensation laws consider such injuries to be compensable? Bearing in mind that each state makes its own laws, the answer depends on what caused the loss of consciousness, and the second asks specifically what happened in the fall that caused the injury? The first question speaks to medical causation, which applies scientific analysis to determine the cause of the problem. The second question addresses legal causation: Under what factual circumstances are injuries of this type potentially covered under the law? Much nuance attends this analysis. The authors discuss idiopathic falls, which in this context means “unique to the individual” as opposed to “of unknown cause,” which is the familiar medical terminology. The article presents three detailed case studies that describe falls that had their genesis in episodes of loss of consciousness, followed by analyses by lawyer or judge authors who address the issue of compensability, including three scenarios from Arizona, California, and Pennsylvania. A medical (scientific) analysis must be thorough and must determine the facts regarding the fall and what occurred: Was the fall due to a fit (eg, a seizure with loss of consciousness attributable to anormal brain electrical activity) or a faint (eg, loss of consciousness attributable to a decrease in blood flow to the brain? The evaluator should be able to fully explain the basis for the conclusions, including references to current science.


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