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EMF Study
(Database last updated on Jun 24, 2020)

ID Number 1241
Study Type Human / Provocation
Model 420 MHz (Tetra), 900, 1800 MHz (GSM), 2 GHz (UMTS) exposure from mobile phones and analyis of cognitive function

Human subjects (n = 40 adolescents + 40 adults) exposed to 2.1 GHz (UMTS) RF for 45 minutes. Immediately prior and following exposure, sujects were evaluated for subjective endpoints (e.g., headache, concentration ability, dizziness). Five minutes after exposure, subjects took 4 tests to measure congnitive function (simple and choice reaction time, rapid visual information processing, paired association, and trail making tests). The authors report a modest increase in headaches when adolescent and adult data were combined (p = 0.027), as well as an increase in concentration difficulty in adults (p = 0.048) with RF exposure. However, the authors suggest this could be due to a differences at baseline, and conclude that the overall results of all endpoints examined do not support the hypothesis that UMTS fields significantly reduce performance in cognitive tests. A subsequent study exposed volunteers to 420 MHz (Tetra) signals at a measured SAR of 2 W/kg per 10 grams (local) for 45 minutes. The authors report no significant changes in cognitive function and reaction time using several tests including a computer-administered Cambridge Neuropsychological Test Automated Battery (CANTAB eclipse), Reaction Time (RTI) and Spatial Span (SSP), Wechsler Adult Intelligence Scale-Third Edition (WAIS-III), and a subtest Digit Span (DSP).

Findings No Effects
Status Completed With Publication
Principal Investigator University of Aarhus, Denmark
Funding Agency Nat'l Res Prog, Denmark
  • Riddervold, IS et al. Bioelectromagnetics, (2010) 31:380-390
  • Riddervold, IS et al. Bioelectromagnetics, (2008) 29:257-267
  • Comments

    Subjects were randomly selected from Civil Person Resitration in Norway, but taken on a first come basis (i.e., could have been some bias in those responding to the volunteer request)