Stefanics G et al. · 2007
Researchers exposed 30 healthy young adults to 10 minutes of 900 MHz radiation from a Nokia cell phone and measured their auditory brainstem response (ABR), which tracks how sound signals travel from the ear to the brain. They found no immediate changes in ABR timing compared to sham exposure. This suggests short-term cell phone use doesn't immediately disrupt the basic hearing pathway in the brainstem.
Shirai T et al. · 2007
Researchers exposed young rats to cell phone-like radiation (1.95 GHz W-CDMA signals) for 2 years to see if it would promote brain tumor development in animals already given a cancer-causing chemical. The study found no significant increase in brain tumors from the radiation exposure at levels of 0.67 and 2.0 W/kg SAR. This suggests that chronic exposure to this type of cell phone radiation does not accelerate brain tumor formation in this animal model.
Schmid G et al. · 2007
Researchers created a detailed computer model of the human inner and middle ear to measure how much radiofrequency energy is absorbed from cell phones held near the head. They found that typical mobile phones deposit extremely small amounts of energy in ear structures - less than 166 microwatts even at the highest frequency tested. The study concluded that cell phone radiation is unlikely to cause temperature-related damage to hearing organs.
Schmid G et al. · 2007
Researchers measured how much radiofrequency energy from cell phones actually reaches the pineal gland, a small brain structure that produces melatonin and regulates sleep cycles. Using tissue samples from 20 human pineal glands and computer modeling, they found that even when a phone operates at maximum power next to your ear, only tiny amounts of RF energy (11 microwatts) are absorbed by this deep brain structure. The scientists concluded that cell phone radiation is unlikely to cause temperature-related effects in the pineal gland.
Preece AW, Georgiou AG, Dunn EJ, Farrow S · 2007
Researchers studied residents living near powerful military radio transmitters in Cyprus to investigate health complaints. They found that people living in exposed villages reported 2.7 to 3.7 times more headaches, migraines, and dizziness compared to unexposed residents, but no increase in cancer or birth defects. The researchers suggested these symptoms were more likely caused by noise from military aircraft or psychological stress from seeing the antennas rather than the radio waves themselves.
Perentos N, Croft RJ, McKenzie RJ, Cvetkovic D, Cosic I. · 2007
Researchers exposed 12 people to mobile phone-like radiofrequency radiation for 15 minutes and measured their brain waves (EEG patterns) to see if the exposure affected brain activity. They found no changes in brain wave patterns from either pulsed or continuous RF exposure. This study failed to replicate earlier research that had found brain wave changes, possibly because this study used more realistic exposure levels that better match actual phone use.
Parazzini M et al. · 2007
European researchers tested whether 10 minutes of GSM cell phone exposure affects hearing in healthy young adults. They used comprehensive hearing tests including threshold levels and inner ear function measurements, comparing real phone exposure to fake exposure in a double-blind study. The results showed no detectable changes to any aspect of hearing function from the electromagnetic field exposure.
Parazzini M et al. · 2007
Italian researchers exposed 26 healthy young adults to cell phone radiation at 900 MHz (2 watts) while measuring heart rate variability, which reflects how well the autonomic nervous system regulates heart rhythm. The study found no statistically significant effects on heart rate patterns during either rest or physical stress, though some minor changes were detected in a few measurements. This suggests that short-term cell phone exposure at typical power levels doesn't meaningfully disrupt the body's automatic control of heart function.
Oftedal G, Straume A, Johnsson A, Stovner L · 2007
Researchers tested 17 people who claimed mobile phones caused their headaches by exposing them to real phone radiation and fake radiation without telling them which was which. The participants actually reported slightly more pain during the fake exposures than the real ones, and their heart rate and blood pressure didn't change based on whether they received real or fake radiation. This suggests mobile phone headaches are likely a nocebo effect - where expecting negative effects can actually cause symptoms even without real exposure.
Klaeboe L, Blaasaas KG, Tynes T. · 2007
Norwegian researchers studied 541 brain tumor patients and 358 healthy controls to see if mobile phone use increased risk of brain tumors (gliomas, meningiomas, and acoustic neuromas). They found that regular mobile phone users actually had lower odds of developing these tumors compared to non-users, with no increasing risk even after 6+ years of use. This suggests mobile phones don't increase brain tumor risk, at least for the exposure levels and time periods studied.
Kan P, Simonsen SE, Lyon JL, Kestle JR. · 2007
Researchers analyzed nine case-control studies involving over 17,000 people to examine whether cell phone use increases brain tumor risk. They found no overall increased risk for typical users, but discovered a 25% higher risk among people who used cell phones for 10 years or longer. This suggests that while short-term use appears relatively safe, long-term exposure may pose health concerns that require further investigation.
Inomata-Terada S et al. · 2007
Japanese researchers tested whether 30 minutes of cell phone radiation affects brain motor control by measuring electrical signals in the motor cortex (the brain region that controls movement) before and after phone exposure in 10 healthy volunteers and 2 multiple sclerosis patients. They found no changes in brain activity or motor function after phone exposure compared to fake exposure. The study suggests short-term cell phone use doesn't immediately impair the brain's ability to control muscle movement.
Haarala C et al. · 2007
Finnish researchers exposed 36 healthy men to mobile phone radiation at two different power levels (continuous and pulsed waves) while they performed cognitive tests, comparing left-brain versus right-brain exposure. They found no measurable effects on thinking abilities, reaction times, or other brain functions from either type of phone radiation. This suggests that typical mobile phone use doesn't impair basic cognitive performance in healthy adults.
Cinel C, Boldini A, Russo R, Fox E. · 2007
Researchers tested whether cell phone radiation affects how well people can detect the order of sounds they hear. They exposed 168 participants to either real cell phone signals (GSM) or fake signals while performing an auditory task, testing both sides of the head. The study found no significant difference in performance between real and fake exposure, suggesting that short-term cell phone radiation doesn't impair this type of hearing ability.
Terao Y et al. · 2007
Researchers tested whether 30 minutes of mobile phone exposure affects eye movement control (saccades) in 10 healthy adults. They measured various types of rapid eye movements before and after exposure to 800 MHz radiation at 0.054 W/kg SAR. The study found no significant changes in eye movement performance, suggesting short-term mobile phone use doesn't impair this aspect of brain function.
Stefanics G et al. · 2007
Researchers tested whether 10 minutes of cell phone radiation affects how quickly the brain processes sound by measuring auditory brainstem responses (electrical signals from the hearing pathway to the brain) in 30 healthy young adults. They found no measurable changes in brain response timing after exposure to 900 MHz radiation from a Nokia phone at typical usage levels. This suggests short-term phone calls don't immediately disrupt the brain's basic hearing functions.
Perentos N, Croft RJ, McKenzie RJ, Cvetkovic D, Cosic I · 2007
Researchers exposed 12 people to mobile phone-like radio frequency radiation for 15 minutes to see if it changed their brain wave patterns (EEG). Unlike some previous studies, they found no changes in brain activity from either pulsed or continuous RF exposure. The researchers used a more realistic exposure setup that better mimicked actual phone use.
Krause CM, Pesonen M, Haarala Björnberg C, Hämäläinen H. · 2007
Finnish researchers exposed 72 men to 902 MHz mobile phone radiation while they performed memory tasks, measuring brain wave patterns through EEG. The study found only modest, inconsistent effects on brain oscillations in the alpha frequency range, with no impact on actual memory performance. The researchers concluded that any brain wave changes from phone radiation appear to be subtle, variable, and difficult to replicate consistently.
Joubert V, Leveque P, Cueille M, Bourthoumieu S, Yardin C. · 2007
French researchers exposed rat brain neurons to cell phone radiation (900 MHz GSM) for 24 hours at levels similar to phone use, then tested whether the radiation caused brain cells to die through a process called apoptosis. Using three different measurement methods, they found no increase in cell death compared to unexposed neurons. This suggests that brief cell phone radiation exposure may not directly damage brain cells in the way some scientists have theorized.
Inomata-Terada S et al. · 2007
Researchers exposed 10 healthy volunteers and 2 multiple sclerosis patients to mobile phone radiation for 30 minutes, then measured brain activity in the motor cortex (the brain region controlling movement) using magnetic stimulation. They found no changes in brain function or nerve signal transmission after the exposure compared to fake exposure sessions. The study suggests that short-term mobile phone use doesn't immediately impair motor cortex function, though the small sample size limits the ability to detect subtle effects.
Haarala C et al. · 2007
Finnish researchers tested whether mobile phone radiation affects thinking skills by having 36 men perform cognitive tasks while exposed to different types of phone signals on either the left or right side of their heads. They found no measurable differences in mental performance between real phone radiation exposure and fake exposure, regardless of which side of the head was exposed. The study suggests that typical mobile phone use doesn't impair basic cognitive functions like memory or attention in healthy adults.
Cinel C, Boldini A, Russo R, Fox E · 2007
Researchers tested whether 40 minutes of mobile phone radiation affects hearing ability by having 168 people perform an auditory task while exposed to phone signals at two different power levels. The study found no significant changes in hearing performance during radiation exposure compared to sham (fake) exposure. This suggests that short-term mobile phone use doesn't impair basic auditory processing abilities.
Arns M, Van Luijtelaar G, Sumich A, Hamilton R, Gordon E · 2007
Researchers analyzed brain activity patterns in 300 people based on their mobile phone usage frequency, measuring brain waves and cognitive function. They found subtle slowing of brain activity in frequent phone users, though these changes remained within normal ranges. The study also showed that heavy phone users had better executive function, possibly due to practicing focused attention during calls in distracting environments.
Zhao TY, Zou SP, Knapp PE · 2007
Researchers exposed brain cells (neurons and astrocytes) to radiation from a working GSM cell phone for just 2 hours and found that genes involved in cell death pathways became more active. The effect occurred even when the phone was on standby mode, and neurons appeared more sensitive to the radiation than astrocytes (support cells in the brain). This suggests that even brief cell phone exposure can trigger cellular stress responses in brain tissue.
Vecchio F et al. · 2007
Italian researchers exposed 10 people to cell phone radiation for 45 minutes while measuring their brain waves with EEG technology. They found that the radiation altered how the left and right sides of the brain communicate with each other, specifically disrupting the synchronization of alpha brain waves that are important for information processing. This suggests that cell phone emissions don't just affect individual brain cells, but can interfere with the coordinated electrical activity between different brain regions.
