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Brain & nervous system

Questions about memory, sleep, symptoms and changes in brain tissue can be difficult to disentangle. This section brings the different kinds of finding together while helping you keep their meaning and exposure conditions in view.

The question in context

Salford RF-020 reported higher blinded dark-neuron scores in rat brains about 50 days after a two-hour exposure. Comparisons were significant at 0.02 and 0.2 W/kg, not 0.002 W/kg. Small mixed-sex groups, ordinal scoring, an embedded figure correction and nonconfirming independent replication CTX-006 constrain this pathology signal. It does not establish permanent human injury or a low-dose human threshold.

Lund follow-up RF-028 found delayed leakage of a blood protein into brain tissue without increased dark neurons. Cognitive and histological papers RF-029 CTX-005 used the same rats: poorer object-order memory was not explained by demonstrated neuronal loss. Handling and test experience complicate interpretation. Other institutions' barrier and cognition findings remain distinguishable where only abstracts were verified.

Blinded human experiments provide a different kind of evidence. EEG changes RF-010 RF-011 and increased regional brain glucose use RF-049 are objective responses with uncertain adverse significance. Lustenberger RF-032 found slightly less sleep and less overnight improvement in one motor-task measure in 16 men. Its unusual pulses and distinct peak, burst and overnight-average doses limit generalisation. Reanalyses of the same participants are not independent experiments.

Foerster's adolescent memory association RF-033 was significant in the operator-data subgroup, while the full-sample confidence interval included zero; an earlier paper overlaps the cohort. Hutter RF-013 reported an adjusted headache association, without a significant sleep-quality association or multiple-testing correction. Functional changes and reported symptoms deserve attention, while observational bias, exposure uncertainty and clinical meaning remain open questions.

The published records

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RF-023Retrieval lead

New hippocampal study awaiting original methods

This is a retrieval lead: the title points to changes in a rat brain region involved in memory. The original paper is worth obtaining to examine the exposure and tissue findings together. Only its bibliographic identity is verified here; methods and numerical claims cannot yet support a conclusion about injury.

Bektas et al. · 2026Animals
WEB-041Original abstract reviewed

28 GHz: measured pain thresholds in human skin

Pain is an outcome people can recognise directly. This experiment measured when intense local millimetre-wave exposure progressed from warmth to pain, and how responses differed between participants. It provides human threshold information under a specific high-exposure protocol.

Yuasa et al. · 2026People
WEB-052Original abstract reviewed

3.5 GHz: oxidative and apoptotic responses in sensory neurons

Peripheral sensory neurons carry information from the body to the nervous system. This study reports that prolonged exposure affected their survival and mitochondrial-apoptotic signalling. It is relevant to investigating neuronal susceptibility, but cannot by itself explain a person’s symptoms.

Bektas et al. · 2026Cells / isolated tissue
WEB-053Original text reviewed

3.5 GHz: microglial stress responses with incomplete dose reporting

Microglia help maintain the brain’s cellular environment. This study reported oxidative and apoptotic responses after exposure, then tested a possible protective intervention. The observations are worth locating, although incomplete absorbed-dose reporting prevents a confident comparison with environmental exposure.

Pachhapure et al. · 2025Cells / isolated tissue
WEB-042Original text reviewed

28 GHz: warmth perception varies with exposure intensity

Knowing when someone first notices warmth helps interpret stronger exposure experiments. These measurements show that perception thresholds and their repeatability depend on the exposure level. That is useful human physiology, even though the protocol was far more intense than ordinary environmental fields.

Yuasa et al. · 2024People
WEB-049Original text reviewed

100 GHz: mitochondrial membranes and cellular respiration

Mitochondria supply energy for much of a cell’s work. This study examined their membranes and function together, reporting structural changes and reduced components of respiration after exposure. It is a useful mechanistic finding to investigate beyond a simple live-or-dead cell count.

Lei et al. · 2024Cells / isolated tissue
RF-011Original text reviewed

Brainwave changes in a blinded human experiment

The brain's response differed depending on whether participants' eyes were open or closed. Because exposure and sham sessions were blinded, this is a useful objective observation. Whether these brainwave changes affect function remains unresolved; the recording itself does not show injury.

Wallace et al. · 2023People
WEB-015Original text reviewed

Human and mouse neural stem-cell injury under 220 GHz exposure

Comparing human and animal cells can reveal differences in susceptibility. This experiment investigates proliferation, DNA-damage markers and cell death at a precisely identified sub-terahertz frequency.

Wang et al. · 2023Cells / isolated tissue
WEB-055Original text reviewed

3.5 GHz: reversible suppression of neuronal firing at high SAR

Recording during exposure can reveal a temporary response that disappears afterwards. This experiment found such inhibition in neuronal cultures at its highest exposure level. Its lower-dose results and heating comparison help define the conditions under which that finding belongs in the discussion.

Canovi et al. · 2023Cells / isolated tissue
RF-037Original text reviewed

LTE effects on sound-evoked cortical activity during experimental inflammation

An inflammatory challenge changed how rats' hearing-related brain cells responded to LTE exposure. In the challenged animals, sound responses weakened and stronger sounds were needed to evoke them. This gives susceptibility a concrete experimental form; recordings from anaesthetised rats do not establish hearing loss in people.

Souffi et al. · 2022Animals
RF-036Original text reviewed

Persistent mouse behavioural changes after early-life LTE exposure

Early development is a period when lasting changes deserve particular attention. Mice exposed before and shortly after birth later behaved differently in several activity measures. The directions varied between exposure groups and the samples were small. Their significance for developmental function remains uncertain; they do not establish a human diagnosis.

Broom et al. · 2019Animals
WEB-030Original text reviewed

60 GHz: sensory neurons respond differently from direct heating

Sensory nerve endings help an organism detect potentially harmful conditions. In isolated leech neurons, intense millimetre waves changed the threshold for nerve firing differently from direct heating. The experiment offers a mechanism to examine; it does not establish the cause of symptoms in people.

Romanenko et al. · 2019Cells / isolated tissue
RF-033Original text reviewed

Prospective cognitive-test association with modeled brain dose

This study followed adolescents and measured changes in memory rather than asking only how much they used phones. A negative association appeared in the subgroup with operator records, while the full-sample estimate was not significant. Developmental function matters; this qualified pattern deserves independent scrutiny.

Foerster et al. · 2018People
RF-031Original abstract verified

Pulse-modulated follow-up in a separate institutional programme

This follow-up used pulsed signals and reported different patterns by sex and frequency in how much blood-borne dye entered brain tissue. It helps define more specific experiments on the brain's protective barrier. Dose and temperature details remain unverified, limiting what the findings reveal about relevant exposure conditions.

Sırav and Seyhan · 2016Animals
RF-034Original abstract verified

Separate Chinese programme with functional, morphological and molecular endpoints

This Chinese experiment reports memory-task difficulty alongside tissue and brain-barrier changes in rats. That combination is worth examining across independent programmes. Only the original abstract has been verified here; the whole-body and local head doses differ sharply and must remain separate when considering relevance.

Tang et al. · 2015Animals
RF-032Original text reviewed

Blinded experiment joins sleep physiology to reduced task improvement

A good night's sleep is something people value for how they function the next day. Under this study's unusual pulsed exposure, young men slept slightly less and showed less overnight improvement on one tapping-task measure. That functional result deserves independent testing; it does not establish a sleep disorder.

Lustenberger et al. · 2013People
RF-041Original text reviewed

Yale prenatal handset mouse experiment with acknowledged dosimetry limits

After exposure during pregnancy, mouse offspring showed altered activity and object recognition. Developmental outcomes deserve attention, but the experiment did not measure how much RF energy the mothers or fetuses absorbed. Its published hormone correction is retained; these results do not establish ADHD or a human prenatal risk level.

Aldad et al. · 2012Animals
RF-030Original abstract verified

Separate Gazi laboratory reports sex-dependent barrier response

A separate laboratory reported a change in passage from blood into brain tissue in male rats, with no corresponding finding in females. This suggests a question about biological differences worth testing directly. The abstract does not establish a statistical difference between sexes, and full methods remain to be checked.

Sırav and Seyhan · 2011Animals
RF-049Original text reviewed

Regional brain glucose metabolism in a blinded crossover experiment

A brain scan detected increased glucose use in the region nearest the active phone's antenna in a blinded human experiment. Glucose use measures brain metabolism, so this provides evidence of an objective response under that protocol. Whether the response affects health or function remains unresolved; the scan did not demonstrate injury.

Volkow et al. · 2011People
RF-046Original abstract verified

Oxidative mitochondrial DNA markers in primary cortical neurons

Mitochondria supply cells with energy and contain their own DNA. In rat nerve cells grown in the laboratory, the abstract reports changes in that DNA after RF exposure. It identifies a possible dysfunction pathway; incomplete methods and temperature information prevent a conclusion about neurological harm in people.

Xu et al. · 2010Cells / isolated tissue
CTX-006Replication and cohort context

Independent test limiting the certainty of the Salford finding

An independent laboratory did not confirm Salford's reported brain-tissue changes. The exposure range and tissue staining were not identical, so the comparison needs care. It keeps reproducibility central. A common blinded protocol could help clarify the difference before conclusions about harmful exposure levels.

Masuda et al. · 2009Animals
RF-028Original text reviewed

Delayed albumin leakage, with a specific significant exposure comparison

Researchers detected a blood protein outside brain vessels a week after exposure, suggesting altered control of passage into brain tissue. They did not find an increase in dark-staining nerve cells. The question is whether the reported barrier change is reproducible and has consequences for brain function.

Nittby et al. · 2009Animals
CTX-005Replication and cohort context

Essential same-cohort boundary for Nittby's cognitive finding

These are the same rats used for the memory paper RF-029 . Their brain-tissue examination did not demonstrate neuronal injury. Reading both papers together prevents a memory-test result from becoming an unsupported claim of brain-cell loss, and prevents one experiment from being counted twice.

Grafström et al. · 2008Animals
RF-027Original abstract verified

Lund time-course follow-up

The blood-brain barrier normally controls what passes from the bloodstream into brain tissue. This follow-up reported leakage and nerve-cell changes at different times after exposure. It makes the timing of tissue examinations important; the abstract alone cannot show which individual exposure levels drove each result.

Eberhardt et al. · 2008Animals
RF-029Original abstract verified

Temporal-order memory after 55 weeks of weekly exposure

Remembering the order of events is a specific mental function. Exposed rats performed less well on an object-order task after a long exposure programme, although other tests were unchanged. Tissue examination of the same animals did not demonstrate neuronal injury, so the behavioural finding needs its own explanation.

Nittby et al. · 2008Animals
RF-010Original text reviewed

Exposure related changes in sleep EEG

Electrical recordings can reveal brain responses that a person may not feel. In this small blinded study, the clearest sleep-brainwave change occurred at the higher exposure; sleep structure was unchanged. Its contribution is a measurable response whose significance for sleep and health still needs to be established.

Regel et al. · 2007People
RF-013Original text reviewed

Symptoms associated with measured bedroom fields

A study of people's homes linked higher estimated base-station fields with more reported headaches, even after adjustment for concern about exposure. This is a reason to investigate symptoms with repeated measurements over time. A single household visit cannot establish whether RF caused the headaches or identify a symptom threshold.

Hutter et al. · 2006People
RF-020Original text reviewed

Blinded rat histology with significant findings at two of three exposure levels

When brain tissue was examined weeks after a two-hour RF exposure, a blinded examiner found higher scores for dark-staining nerve cells in some rat groups. This makes delayed tissue changes worth examining. The lowest dose was nonsignificant and independent replication did not confirm the result; permanent human injury was not established.

Salford et al. · 2003Animals
RF-012Original abstract verified

Pulse modulation and regional blood flow

The way a radio signal is delivered may matter as well as its frequency. This human study's abstract reports different brainwave responses to pulsed and continuous signals, alongside blood-flow changes. Full methods still need review before drawing dose conclusions; the observation points to waveform as a health-assessment question.

Huber et al. · 2002People