EMF Evidence Library
Research library/Brain & nervous system/CTX-005
CTX-005Replication and cohort context

Essential same-cohort boundary for Nittby's cognitive finding

Grafström et al. · 2008 · Brain Research Bulletin

The reported finding

Blinded histology found no significant group differences in albumin leakage, dark neurons, glial reactions, lipofuscin or cytoskeletal/neuritic changes. No correlation joined albumin leakage/dark neurons to cognitive performance. Thus the cognitive observation was not explained by demonstrated neuronal damage.

Reading it carefully

Included solely as a necessary same-cohort interpretive boundary, not as a separately recruited reassuring-literature sample. Brain-SAR orientation variability was substantial (56% standard deviation around average). Later review quoted an erroneous 0.06-0.6 W/kg range; use original units.

Inside the study

Exposure conditions
Same weekly GSM-900 exposures for 55 weeks as RF-029; initial whole-body SAR 0.0006 or 0.06 W/kg; final approximately 0.0004 or 0.04 W/kg. Animals examined 6-7 weeks after last exposure.
Design & controls
Original methods: 56 randomized mixed-sex Fischer 344 rats, four groups (16 low,16 high,16 sham,8 cage); 54 brains available; neuropathologist blind, cresyl violet/albumin/GFAP/Sudan Black B/Gallyas staining.
Related research & shared cohorts
Identical animals to RF-029; count once. Earlier acute Salford experiments differ in regimen and age.
The protection question raised
Can a memory-test difference be explained by neuronal damage in these rats? The companion histology did not demonstrate it. Functional and tissue endpoints remain distinct, and these publications represent the same cohort.
Source verification
Original indexed body, all 35,875 characters read through Scite
Where to find the result
GSM exposure; Animals; Histopathology and methods; Histopathological examinations; Individual correlation; Discussion
Editorial notices
Scite metadata checked 20 Oct 2026; no editorial notice returned. Primary bibliographic records and targeted notices were checked where retrievable; no retraction or expression of concern located. This is not certification that no notice exists.
Funding
Not stated in indexed body obtained; not inferred.
Conflicts of interest
Not stated in indexed body obtained; not inferred.

Original publication

Grafström G, Nittby H, Brun A, Malmgren L, Persson BRR, Salford LG, Eberhardt J. Histopathological examinations of rat brains after long-term exposure to GSM-900 mobile phone radiation. Brain Research Bulletin. 2008;77(5):257-263. doi:10.1016/j.brainresbull.2008.08.004.

Plain-text record