study on brain function
Previous items in "What's New" (May and July, 2000) have discussed
studies by Finnish researchers on RF exposure and brain function. This
group has published another study that suggests that RF fields affected
performance of memory tasks. As with previous studies, the RF fields
appeared to facilitate rather than disrupt performance. The effects
were small and the authors state that the effect "probably has
no practical implications for performance in daily life". The physiological
mechanism is still not understood. For more details, see "Research
- Clinical - cognitive function".
Koivisto M, Krause CM, Revonsuo A, Laine M, Hamalainen H. The effects
of electromagnetic field emitted by GSM phones on working memory. NeuroReport
another study on EEGs
A number of studies have been reported on RF exposure
and EEGs, with inconsistent
results. Hietanen and colleagues have reported a further study. Their
results suggest that exposure to RF fields emitted by cellular phones
has no abnormal effects on human EEG activity. For more details, see
"Research - Clinical -EEG".
Hietanen M, Kovala T, Hamalainen A-M. Human brain activity during exposure
to radiofrequency fields emitted by cellular phones. Scand J Work Environ
of scalp nerve abnormality with prolonged use of a cell phone
Dr. Bruce Hocking of Australia has previously suggested that some cellular
phone users can develop symptoms on the side of the head where they
use their phone. He now reports a case of a 72-year-old man who, after
two mobile phone calls of nearly an hour each on consecutive days, had
persistent symptoms like "a bruised feeling" on his scalp,
adjacent to the site where the cell phone was located. Tests of the
nerves that supply sensation to the skin of the affected areas showed
disturbances of the threshold for perception of sensation. The authors
suggest that these findings are not due to thermal mechanisms, since
the blood supply to the scalp is good and since the patient had no previous
trouble despite exposure to many Australian summers.
should be emphasised that this report is based on a single case. An
assumption of a causative association would require, amongst other things,
confirmation of the findings in other individuals.
Hocking B, Westerman R. Neurological abnormalities associated with mobile
phone use. Occup Med 2000;50:366-368.