Browse 8,655 peer-reviewed studies on electromagnetic field health effects from 4 research libraries.
Showing 2,753 studies in Brain & Nervous System
John F. Davis et al.
This technical paper describes the development of equipment to measure tiny electrical responses in the brain that occur after stimulation. The research focused on creating better methods to detect these weak brain signals, which are normally hidden beneath electrical noise at the scalp surface.
Unknown authors
The FDA's Center for Devices and Radiological Health (CDRH) conducted internal research projects examining how microwave radiation affects biological systems. The studies focused on behavioral changes, cellular membrane effects, and how cells respond to electromagnetic exposure, including interactions with pharmaceutical compounds.
Allan H. Frey
Researchers exposed frog hearts to UHF radar energy synchronized with their heartbeats, finding that timing the radiation pulses with specific parts of the cardiac cycle (the R wave) produced significant effects on heart function. This early study demonstrated that radar frequencies can directly influence cardiac rhythm when precisely timed with natural electrical activity.
Unknown authors
Researchers tested whether 60 Hz electrical fields (the frequency used in North American power systems) affect motor coordination and balance in rats using specialized equipment called a rotorod. The study found measurable differences between rats exposed to these electrical fields and control rats, suggesting that power frequency EMF exposure may impact basic motor functions.
Unknown authors
Researchers developed a system using radiofrequency electromagnetic fields to heat ferromagnetic implants placed in brain tumors, creating localized hyperthermia for cancer treatment. The study found that frequencies below 2 MHz effectively heated 1-2mm implants to create temperature differences greater than 4°C within 1 cm of the implant site. This targeted heating approach aims to treat aggressive brain cancers like glioblastoma by making tumor cells more vulnerable to radiation therapy.
Unknown authors
Researchers exposed rats to powerful 60-Hz electric fields (100 kV/m) for 30 days, then tested whether this changed their behavior around electric fields. Pre-exposed rats actually preferred staying in areas with electric fields, while unexposed rats avoided them, suggesting chronic exposure creates adaptation or tolerance.
Unknown authors
Researchers trained rats to perform precise timing tasks, then exposed them to 2.8 GHz pulsed microwaves at power levels similar to early cell phones. The microwave radiation disrupted the animals' ability to maintain accurate timing behavior, with stronger effects at higher power levels. Importantly, the same radiation had no effect when the timing task was made easier, suggesting the microwaves specifically interfere with complex behavioral control.
Unknown authors
Researchers trained rats to perform timing tasks requiring precise 18-24 second intervals between lever presses for food rewards. When exposed to low-level microwave radiation (2.45 GHz pulsed at 1-5 mW/cm²), the sedative drug pentobarbital became significantly more potent, requiring 40% lower doses to produce the same behavioral effects. This demonstrates that microwave exposure can amplify drug effects in the brain.
Unknown authors
Researchers exposed rats to intense 918 MHz microwave radiation for 30 minutes to see if it would help antibodies cross the blood-brain barrier to fight infections. The microwaves raised body temperature to dangerous levels but failed to allow antibodies into the cerebrospinal fluid. The study found no evidence that microwave exposure could breach the brain's protective barriers.
Unknown authors
Researchers exposed pregnant mice to microwave radiation at 2450 MHz (the same frequency as microwave ovens and WiFi) for 3 hours daily during critical brain development periods. They then tested the newborn pups for basic reflexes and neurological development from birth through 21 days old. The study aimed to understand whether low-level prenatal microwave exposure affects behavioral development in offspring.
Unknown authors
Scientists measured brain temperatures in awake rats exposed to 2450 MHz microwave radiation at 65 mW/cm² for 30 or 90 minutes. They tracked temperatures in four specific brain regions (cortex, hypothalamus, cerebellum, and medulla) plus colon temperature to understand how microwaves affect brain heating. This research aimed to clarify whether microwave-induced blood-brain barrier changes are linked to temperature increases.
Unknown authors
Researchers exposed rats to 2.45 GHz microwave radiation at 40 mW/cm² for 2 hours, with some rats also receiving thyroid hormone injections to increase their metabolic rate. The study found that microwave exposure significantly increased stress hormone (corticosterone) levels and disrupted thyroid function, with effects amplified when combined with elevated metabolism.
A. DEFICIS, J.C. DUMAS, S. LAURENS
This conference paper examined biological changes in Swiss mice exposed to microwave radiation, focusing on effects to nervous system function and immune responses. The research investigated how microwave irradiation altered normal biological processes, including nerve conduction and immune system activity. This type of foundational research helps establish the biological mechanisms through which microwave radiation affects living systems.
Unknown authors
Researchers trained rhesus monkeys to position their heads directly in front of a 9.31 GHz microwave beam while performing a lever-pressing task for juice rewards. The study found no measurable effects on the monkeys' behavior during microwave exposure. This research examined whether high-frequency microwaves similar to some radar systems could disrupt trained behavioral responses.
Unknown authors
Researchers exposed pregnant rats and their offspring to 100-MHz radiofrequency radiation for 4 hours daily throughout pregnancy and early development. While most health measures remained normal, the study found significant changes in brain acetylcholinesterase activity, an enzyme crucial for nerve function. This suggests that chronic RF exposure during critical development periods may affect brain chemistry even when other health indicators appear unaffected.
Unknown authors
Researchers exposed neuroblastoma cancer cells to pulsed magnetic fields at 2 gauss intensity and found the fields could alter cell behavior, causing changes in how cells grew extensions (dendrites) and adhered to surfaces. The magnetic field patterns appeared to influence whether cells remained cancerous or began transforming back toward normal cell behavior.
Unknown authors
Researchers exposed rats to 2800 MHz microwave radiation for 90 minutes before testing their ability to learn new sequences of behaviors. At higher power levels (5-10 mW/cm²), the microwaves disrupted the rats' learning ability, causing more errors and slower completion of tasks. This demonstrates that microwave radiation can impair cognitive function even at relatively low exposure levels.
Unknown authors
Researchers exposed brain tissue to 147 MHz radiation modulated at 16 Hz and found it caused calcium ions to leak from cells at specific power levels (0.75 mW/cm²). The effect occurred within a narrow "window" of field strength, and the width of this window changed depending on how many tissue samples were tested at once.
Unknown authors
Researchers exposed African baboons to extremely high intensity 60 Hz electric fields (up to 60,000 volts per meter) to study behavioral changes. This preliminary Department of Energy study examined both individual performance tasks and social behaviors before, during, and after exposure. The research aimed to develop protocols for a larger investigation into how power line frequency fields affect primate behavior.
Unknown authors
Researchers exposed pregnant rats to 2450 MHz microwave radiation (the same frequency used in microwave ovens and some WiFi) to study birth defects. The study found that specific abnormalities only occurred at radiation levels high enough to kill the mother rats, while lower levels still caused reduced fetal body weight and brain mass.
Unknown authors
Researchers exposed squirrel monkeys to microwave radiation to determine the minimum energy levels that would alter their natural temperature regulation behaviors. The study found that microwaves can penetrate deeper than infrared radiation and disrupt how animals maintain their body temperature through behavioral responses.
Unknown authors
Researchers exposed rats to 2.45 GHz microwave radiation (the same frequency used in microwave ovens and WiFi) at various power levels for 4 hours and measured stress hormone levels. They found a surprising dual effect: low-level exposures actually suppressed the normal rise in corticosterone (stress hormone), while high-level exposures dramatically increased it. This suggests microwave radiation can disrupt the body's natural stress response system in complex ways.
H. Lai, A. Horita, A.W. Guy
Researchers exposed rats to 2450-MHz microwave radiation for 45 minutes at low power levels (0.6 W/kg) and measured effects on brain neurotransmitter systems. They found that microwave exposure disrupted choline uptake in multiple brain regions, with different effects depending on whether the radiation was continuous or pulsed.
K. I. Kuz'mina, N.P. Irodova, L. Yu. Rabichev
This technical report examined how electric and magnetic fields affect the human central nervous system (CNS), with particular focus on electroacupuncture and electrical stimulation therapy applications. The research explored therapeutic uses of electromagnetic fields, including the LIDA device, which was used in Soviet-era medical treatments.
R. JOLY, B. SERVANTIE
French researchers examined how radar frequencies (300-30,000 MHz) affect human tissues and biological systems. They found that these high-frequency electromagnetic radiations, typically emitted in pulses for radar detection, produce measurable biological effects in living tissue. The effects depend on the radiation's physical characteristics, penetration depth, power density, and exposure duration.