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Brain & Nervous System

Effects of concurrent caffeine and mobile phone exposure on local target probability processing in the human brain

No Effects Found

Trunk A, Stefanics G, Zentai N, Bacskay I, Felinger A, Thuróczy G, Hernádi I · 2015

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UMTS mobile phone radiation at typical exposure levels showed no immediate effects on brain activity or reaction times during a 15-minute cognitive task.

Plain English Summary

Summary written for general audiences

Researchers exposed 25 people to UMTS mobile phone radiation (similar to 3G signals) for 15 minutes while they performed visual tasks, with some participants also given caffeine. While caffeine improved reaction times and brain arousal as expected, the mobile phone radiation had no detectable effects on brain activity or cognitive performance, either alone or when combined with caffeine.

Why This Matters

This study provides useful data on UMTS radiation exposure at 1.75-2 W/kg SAR, which is within the range of typical mobile phone use during calls. The researchers used established brain monitoring techniques and found no cognitive effects from 15 minutes of exposure. However, this negative finding should be viewed within the broader context of EMF research, where numerous studies have documented various biological effects from radiofrequency radiation. The 15-minute exposure duration, while sufficient for this specific cognitive task, represents a fraction of daily mobile phone use for most people. What this means for you is that while this particular study didn't find acute cognitive effects, it doesn't address the potential for longer-term or cumulative impacts that concern many researchers in this field.

Exposure Details

SAR
1.75 ,2 W/kg
Exposure Duration
15 minutes

Exposure Context

This study used 1.75 ,2 W/kg for SAR (device absorption):

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 1.75 ,2 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)This level is 1 times the FCC limit

Study Details

Here we investigated whether caffeine intake and concurrent exposure to Universal Mobile Telecommunications System (UMTS) MP-like irradiation may interactively influence neuro-cognitive function in an active visual oddball paradigm.

In a full factorial experimental design, 25 participants performed a simple visual target detection ...

We found that RT was shorter in High vs. Low local probability trials and caffeine further shortened...

However, in the present pharmacologically validated study UMTS exposure either alone or in combination with caffeine did not alter RT or pre-stimulus oscillatory brain activity.

Cite This Study
Trunk A, Stefanics G, Zentai N, Bacskay I, Felinger A, Thuróczy G, Hernádi I (2015). Effects of concurrent caffeine and mobile phone exposure on local target probability processing in the human brain Sci Rep. 5:14434, 2015.
Show BibTeX
@article{a_2015_effects_of_concurrent_caffeine_2816,
  author = {Trunk A and Stefanics G and Zentai N and Bacskay I and Felinger A and Thuróczy G and Hernádi I},
  title = {Effects of concurrent caffeine and mobile phone exposure on local target probability processing in the human brain},
  year = {2015},
  
  url = {https://www.nature.com/articles/srep14434},
}

Quick Questions About This Study

A 2015 study found that 15 minutes of UMTS mobile phone radiation had no detectable effects on brain activity or cognitive performance during visual tasks. Twenty-five participants showed no changes in reaction times or brain oscillations from the 3G-like signals, even when combined with caffeine.
Research shows caffeine and UMTS phone radiation together do not impair brain function. While caffeine improved reaction times and brain arousal as expected, adding mobile phone radiation produced no additional effects on cognitive performance or pre-stimulus brain activity in this pharmacologically validated study.
Fifteen minutes of UMTS mobile phone exposure does not change visual processing in the brain. A controlled study measuring brain oscillations and reaction times during visual probability tasks found no alterations in local target probability processing, despite using sensitive neurophysiological measurements.
UMTS phone radiation does not affect brain waves during cognitive tasks. The study measured pre-target alpha and gamma brain oscillations during visual processing and found no changes from mobile phone exposure, either alone or when participants also consumed caffeine.
Short-term 3G phone radiation does not alter implicit memory function. While caffeine improved implicit short-term memory efficiency during high probability visual trials, UMTS mobile phone radiation produced no measurable effects on memory-related brain processes or reaction times in this controlled experiment.