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But harmful? If young people make a lot of phone calls, this could have a negative impact on their memory development. As revealed by a Swiss study of 700 adolescents, the increased exposure to radiation mainly affects visual and figurative memory. Frequent calls hold their phone mainly on the left side of the head, but the verbal memory is more affected, as reported by the researchers
Increased exposure to wireless phone radiation could have negative effects, at least for young people. © OJO image / iStock 
The question of whether and how cell phone radiation damages health is still very controversial. Studies on the consequences of increasing radiation exposure of radiofrequency electromagnetic fields have so far yielded conflicting results. There is evidence of a local increase in brain activity and changes in the brain's ionic balance. However, while the World Health Organization (WHO) classifies potentially carcinogenic cellular radiation, one of the largest studies to date has been sharper.
700 young people tested
. Milena Foerster of the Basel Tropical and Health Institute and her colleagues from the mobile phone radiation: The effect on the verbal and figurative memory of adolescents. "In particular, this age group has a particularly high exposure to mobile phone radiation, but the developing brain may be particularly sensitive to radiation-related changes," explains the researcher
. From 12 to 17 years old from special applications and surveys. Also on which side they were holding the phone or the cordless phone during the call, was determined. In addition, the verbal and figurative (visual) memory of adolescents was determined through standardized tests during the course of the study. Memory Effect Among Frequent Callers
As might be expected, the more young people used their cell phones or cordless telephones to call, the higher the radiation load on their brains. Frequent callers spent an average of 25 minutes per day on wireless phone calls and therefore had an average daily radiation dose of 1,214 milljoules per kilogram of body weight per day. On the other hand, the daily dose was half of that of the few telephones
However, the decisive factor was that the more the young people telephoned on the cell phone, the more their performance in the test of the figurative memory ended. The decrease in the effect of figurative memory was particularly pronounced and statistically significant among participants, who held their cell phones on the right side of the head, where the areas of visual memory are important, as they explain. Researchers
where the phone is not held to the head has shown no effect.
© Milenko Bokan / thinkstock <img src = "http://www.scinexx.de/grafiken/web/zoom.gif" alt = "Zoom" class = "zoom" style = "Width: 14px; No effect on texting and surfing
In verbal memory, however, there was no clearly negative effect of mobile phone use with one exception: those who kept their cell phones on the left side of their helmet worse, as reported by Foerster and colleagues This could be explained by the fact that the left side of the head is the seat of the center of speech.
Interesting also: In the case of young people, who played a lot on the mobile phone, who sent text messages and used it to surf, but who did not call much, this effect is not Is not produced. Pure distraction and other effects of continuous mobile communication are therefore not responsible for the negative effect. "This suggests that the electromagnetic radiation absorbed by the brain is responsible for the observed relationships," says Martin Rsli, a colleague of Foerster.
The results remain to be verified
According to researchers, their findings demonstrate that intensive research has been conducted using the mobile phone and, as a result, increasing the radiation of mobile phones in adolescents could have negative effects on the development of memory. "However, our findings need to be confirmed in other studies with other populations and to rule out the influence of other factors," said Foerster and his colleagues
In addition: "How high frequency mobile radio fields interact with the brain, underline the researchers." Until now, there is no biological model for how different levels of radiation operate independently of each other. An increase in body temperature. "Nevertheless, they recommend keeping the radiation exposure as low as possible while phoning, for example
through the use of headphones or speakers during the conversation. (Environmental Health Perspectives, 2018, doi: 10.1289 / EHP2427)
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