Mobile phone use for 5 minutes can cause significant memory impairment in humans.

Hellenic journal of nuclear medicine · 2017 · Harm · Low evidence

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HarmLow evidencePaper 4894

Study snapshot

PublicationHellenic journal of nuclear medicine · 2017

Study typeother

Reported directionHarm

Evidence ratingLow

Abstract

INTRODUCTION: Concerns about the possible adverse health effects of mobile phones (MP) have increased along with the expansion of their use. A number of research papers have tried to address this issue. Although many investigations concluded that MP use does have negative consequences, in terms of cognitive function of the human brain, the results so far have been divisive. A number of studies reported impairment of cognitive function after exposure to mobile phone electromagnetic field (MP EMF), while others observed no effect or improved performance. The variance in the results may be attributed to methodological issues. The present article focuses on possible effects of MP use on cognitive function and more specifically on working memory processes. An emphasis is placed in the lack of a validated tool, a cognitive task, that can produce MP EMF effects on human cognition in a repeatable fashion. METHODS: Sixty four (64) healthy participants as well as 20 with Mild Cognitive Impairment (MCI) were the experimental group, while 36 healthy individuals were the control group. A computerized list of 10 words was presented and the participants were asked to reproduce it. The words were presented very briefly in order to increase the difficulty and hence the sensitivity of the task. Three measurements were taken for the experimental group: a) before using the MP, b) immediately after using the MP for a duration of 5 minutes, c) 5 minutes after the second measurement with no usage of the MP in between. Three measurements of the memory task were also taken for the control group in the same time intervals with no usage of a MP. The effect of age and gender in the performance of the task was taken into account. RESULTS: Healthy participants of the experimental group performed worst in the memory task after using the MP. While the third measurement (5 minutes after the 2nd measurement) was better than the second (after using the MP), but worse than the first (before using the MP). In contrast for the control group the second measurement was better than the first and the third even better than both previous ones. All differences were statistically significant. The reduction of the performance in the task after using the MP was even higher for the age group of 60-80 years old in comparison with younger age groups, as well as for the individuals with MCI in comparison to healthy participants. Age was significantly negative correlated with performance in the task, while gender showed no significant correlation. CONCLUSION: MP use has a significant negative impact on working memory performance of human participants. The effect is apparent even for a 5 minute use of the MP. Working memory deficits are greater not only for the 60 years old and above participants but also for individuals with Mild Cognitive Impairment. These results are in agreement with previous studies on animals as well as humans on the effects of MP use on the brain. It is argued that low sensitivity of some of the cognitive tasks used until now and the lack of a validated tool in the form of a cognitive task may account for some of the variability in the literature so far. It is suggested that the experimental paradigm that was used in this study for an increased sensitivity measurement of cognitive function and working memory processes in particular may be used for the display of the effects of MP use on cognitive function and for the development of other tasks sensitive to it. Overall, it is concluded that the development of certain restrictions on MP use is necessary for the protection of the brain health of the users.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeother

Effect directionharm

PopulationHealthy participants and individuals with Mild Cognitive Impairment (MCI); control group of healthy individuals

Sample size120

ExposureRF · 5 minutes

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Healthy participants in the experimental group performed worst on the memory task immediately after 5 minutes of mobile phone use; performance partially recovered 5 minutes later but remained worse than baseline. Control participants (no phone use) improved across repeated measurements; differences were reported as statistically significant, with larger reductions among ages 60–80 and among participants with MCI.

Outcomes measured

Working memory performance (computerized 10-word list recall task)

Limitations

Exposure characteristics (e.g., frequency, SAR, phone model, network conditions) not reported in abstract
Randomization/blinding/sham exposure not described in abstract
Outcome is a single, specific memory task; broader cognitive domains not assessed
Potential practice/learning effects evident in control group; how this was controlled beyond having a control group is not detailed in abstract
Timing limited to immediate and 5-minute post-exposure; no longer-term follow-up described

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "5 minutes"
  },
  "population": "Healthy participants and individuals with Mild Cognitive Impairment (MCI); control group of healthy individuals",
  "sample_size": 120,
  "outcomes": [
    "Working memory performance (computerized 10-word list recall task)"
  ],
  "main_findings": "Healthy participants in the experimental group performed worst on the memory task immediately after 5 minutes of mobile phone use; performance partially recovered 5 minutes later but remained worse than baseline. Control participants (no phone use) improved across repeated measurements; differences were reported as statistically significant, with larger reductions among ages 60–80 and among participants with MCI.",
  "effect_direction": "harm",
  "limitations": [
    "Exposure characteristics (e.g., frequency, SAR, phone model, network conditions) not reported in abstract",
    "Randomization/blinding/sham exposure not described in abstract",
    "Outcome is a single, specific memory task; broader cognitive domains not assessed",
    "Potential practice/learning effects evident in control group; how this was controlled beyond having a control group is not detailed in abstract",
    "Timing limited to immediate and 5-minute post-exposure; no longer-term follow-up described"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "mobile phone",
    "RF EMF",
    "working memory",
    "cognition",
    "memory impairment",
    "Mild Cognitive Impairment",
    "aging"
  ],
  "suggested_hubs": [
    {
      "slug": "mobile-phones",
      "weight": 0.9,
      "reason": "Study evaluates cognitive effects after short-duration mobile phone use."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: Not supplied
PubMed: 29324924

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