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Estudio de Andrew A. Marino

Domingo 13 de noviembre de 2005 · 1867 lecturas



Bioelectromagnetics 24:339^346 (2003)

Nonlinear Changes in Brain Electrical Activity Due to Cell Phone Radiation

Andrew A. Marino,1,2,3* Erik Nilsen,1
and Clifton Frilot1
1Department of Orthopaedic Surgery, Louisiana StateUniversityHealth Sciences Center,
Shreveport, Louisiana
2Department of Cellular Biology andAnatomy, Louisiana State University Health
Sciences Center, Shreveport, Louisiana
3Department of Bioengineering, LouisianaTech University, Ruston, Louisiana

We studied the effect of an electromagnetic field from a cellular telephone on brain electrical activity,
using a novel analytical method based on a nonlinear model. The electroencephalogram (EEG) from
rabbits was embedded in phase space and local recurrence plots were calculated and quantified using
recurrence quantitation analysis to permit statistical comparisons between filtered segments of
exposed and control epochs from individual rabbits. When the rabbits were exposed to the radiation
from a standard cellular telephone (800 MHz band, 600 mW maximum radiated power) under
conditions that simulated normal human use, the EEG was significantly affected in nine of ten animals
studied. The effect occurred beginning about 100 ms after initiation of application of the field and
lasted -300 ms. In each case, the fields increased the randomness in the EEG. A control procedure
ruled out the possibility that the observations were a product of the method of analysis. No differences
were found between exposed and control epochs in any animal when the experiment was repeated after
the rabbits had been sacrificed, indicating that absorption of radiation by the EEG electrodes could not
account for the observed effect. No effect was seen when deposition of energy in the brain was
minimized by repositioning the radiating antenna from the head to the chest, showing that the type of
tissue that absorbed the energy determined the observed changes in the EEG. We conclude that, in
normal use, the fields from a standard cellular telephone can alter brain function as a consequence of
absorption of energy by the brain. Bioelectromagnetics 24:339-346, 2003. - 2003 Wiley-Liss, Inc.

Key words: recurrence quantification analysis; phase space; electroencephalogram

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