Repetitive exposure to a 7 Tesla static magnetic field of mice in utero does not cause alterations in basal emotional and cognitive behavior in adulthood

Plain English Summary

Summary written for general audiences

Researchers exposed pregnant mice repeatedly to extremely powerful 7 Tesla magnetic fields (thousands of times stronger than typical MRI machines) and then tested their offspring's behavior and learning abilities as adults. The study found no detectable effects on emotional behavior, spatial learning, or cognitive function in the adult mice who had been exposed in the womb.

Why This Matters

This study provides reassuring evidence about prenatal exposure to extremely strong static magnetic fields, but we need to put the exposure levels in perspective. At 7 Tesla, these magnetic fields were roughly 140,000 times stronger than Earth's natural magnetic field and significantly more powerful than standard 1.5-3 Tesla MRI machines used in hospitals. The fact that even these extreme exposures produced no measurable behavioral or cognitive effects in adult offspring suggests considerable resilience in developing nervous systems.

What this means for you is that typical MRI exposures during pregnancy appear even safer by comparison. However, this study only examined static magnetic fields, not the radiofrequency radiation that accompanies MRI scans or the pulsed electromagnetic fields from everyday devices. The research landscape on prenatal EMF exposure remains mixed, with some studies showing developmental effects from much lower exposures to different types of electromagnetic fields.

Cite This Study

Unknown (2012). Repetitive exposure to a 7 Tesla static magnetic field of mice in utero does not cause alterations in basal emotional and cognitive behavior in adulthood.

Show BibTeX

@article{repetitive_exposure_to_a_7_tesla_static_magnetic_field_of_mice_in_utero_does_not_cause_alterations_in_basal_emotional_and_cognitive_behavior_in_adulthood_ce4410,
  author = {Unknown},
  title = {Repetitive exposure to a 7 Tesla static magnetic field of mice in utero does not cause alterations in basal emotional and cognitive behavior in adulthood},
  year = {2012},
  doi = {10.1016/j.reprotox.2012.03.006},
  
}

DOI: 10.1016/j.reprotox.2012.03.006 PubMed: 22484359

Quick Questions About This Study

This study suggests high-field MRI is likely safe, as mice exposed to 7 Tesla fields in utero showed normal behavior and learning as adults. Most hospital MRI machines use much weaker 1.5-3 Tesla fields.

A 7 Tesla field is about 140,000 times stronger than Earth's magnetic field and more than twice as powerful as most hospital MRI machines, which typically operate at 1.5-3 Tesla.

This study found no effects on emotional behavior, spatial learning, or cognitive function in mice exposed to extremely strong magnetic fields before birth, suggesting developing brains are relatively resilient.

Yes, static magnetic fields like those in MRI don't change over time, while cell phones emit radiofrequency radiation that oscillates millions of times per second. These are completely different types of electromagnetic exposure.

Scientists used well-validated tests to measure emotional behavior, spatial learning, and cognitive function in adult mice. All tests showed normal results despite the extreme prenatal magnetic field exposure.