Is the brain influenced by a phone call? An EEG study of resting wakefulness

We recorded the resting electroencephalogram of 20 healthy subjects in order to investigate the effect of electromagnetic field (EMF) exposure on EEG waking activity and its temporal development. The subjects were randomly assigned to two groups and exposed, in double-blind conditions, to a typical mobile phone signal (902.40 MHz, modulated at 217 Hz, with an average power of 0.25 W) before or during the EEG recording session. The results show that, under real exposure as compared to baseline and sham conditions, EEG spectral power was influenced in some bins of the alpha band. This effect was greater when the EMF was on during the EEG recording session than before it. The present data lend further support to the idea that pulsed high-frequency electromagnetic fields can affect normal brain functioning, also if no conclusions can be drawn about the possible health effects.

[1]  N. Kuster,et al.  Electromagnetic fields, such as those from mobile phones, alter regional cerebral blood flow and sleep and waking EEG , 2002, Journal of sleep research.

[2]  A. Kleinschmidt,et al.  Electroencephalographic signatures of attentional and cognitive default modes in spontaneous brain activity fluctuations at rest , 2003, Proceedings of the National Academy of Sciences of the United States of America.

[3]  W. Dimpfel,et al.  The influence of electromagnetic fields on human brain activity. , 1995, European journal of medical research.

[4]  Robert C. Beason,et al.  Responses of neurons to an amplitude modulated microwave stimulus , 2002, Neuroscience Letters.

[5]  F. Perrin,et al.  Tonotopic organization of the human auditory cortex: N100 topography and multiple dipole model analysis. , 1995, Electroencephalography and clinical neurophysiology.

[6]  Rodney J Croft,et al.  Acute mobile phone operation affects neural function in humans , 2002, Clinical Neurophysiology.

[7]  J Röschke,et al.  No short-term effects of digital mobile radio telephone on the awake human electroencephalogram. , 1997, Bioelectromagnetics.

[8]  G. D'Inzeo,et al.  Time-course of electromagnetic field effects on human performance and tympanic temperature , 2004, Neuroreport.

[9]  Alvaro Pascual-Leone,et al.  Handbook of transcranial magnetic stimulation , 2002 .

[10]  F. Prato,et al.  Human electrophysiological and cognitive effects of exposure to ELF magnetic and ELF modulated RF and microwave fields: A review of recent studies , 2002, Bioelectromagnetics.

[11]  T. Åkerstedt,et al.  Subjective and objective sleepiness in the active individual. , 1990, The International journal of neuroscience.

[12]  P Wainwright,et al.  Thermal effects of radiation from cellular telephones. , 2000, Physics in medicine and biology.

[13]  D. Carpenter,et al.  Biological effects of electric and magnetic fields , 1994 .

[14]  Martin Blank,et al.  Electromagnetic Fields: Biological Interactions and Mechanisms , 1995 .

[15]  Peter Achermann,et al.  Pulsed high-frequency electromagnetic field affects human sleep and sleep electroencephalogram , 1999, Neuroscience Letters.

[16]  M. Repacholi.  Low-level exposure to radiofrequency electromagnetic fields: health effects and research needs. , 1998, Bioelectromagnetics.

[17]  G. Hyland.  Physics and biology of mobile telephony , 2000, The Lancet.

[18]  D L Hamblin,et al.  Effects of mobile phone emissions on human brain activity and sleep variables , 2002, International journal of radiation biology.

[19]  W. Klimesch.  EEG alpha and theta oscillations reflect cognitive and memory performance: a review and analysis , 1999, Brain Research Reviews.

[20]  M Hietanen,et al.  Human brain activity during exposure to radiofrequency fields emitted by cellular phones. , 2000, Scandinavian Journal of Work, Environment and Health.

[21]  W. R. Adey,et al.  Tissue interactions with nonionizing electromagnetic fields. , 1981, Physiological reviews.

[22]  M A Stuchly,et al.  Interaction of radiofrequency and microwave radiation with living systems , 1979, Radiation and environmental biophysics.

[23]  G. Swaen,et al.  Mobile phones and children: Is precaution warranted? , 2004, Bioelectromagnetics.

[24]  S. Pisa,et al.  Specific absorption rate and temperature increases in the head of a cellular-phone user , 2000 .

[25]  Matti Laine,et al.  Effects of a 902 MHz mobile phone on cerebral blood flow in humans: a PET study , 2003, Neuroreport.

[26]  Xiaodong Chen,et al.  Effects of low intensity radiofrequency electromagnetic fields on electrical activity in rat hippocampal slices , 2001, Brain Research.

[27]  M. Barteri,et al.  Structural and kinetic effects of mobile phone microwaves on acetylcholinesterase activity. , 2005, Biophysical chemistry.

[28]  N. Kuster,et al.  Exposure to pulse‐modulated radio frequency electromagnetic fields affects regional cerebral blood flow , 2005, The European journal of neuroscience.

[29]  M Koivisto,et al.  Effects of electromagnetic field emitted by cellular phones on the EEG during a memory task , 2000, Neuroreport.

[30]  Stephen F. Cleary,et al.  Effects of Radio-Frequency Radiation on Mammalian Cells and Biomolecules In Vitro , 1995 .