This Flatworm Lost Its Memory. Your Phone Is Stronger

At 1 microtesla, electromagnetic fields eliminated memory formation in living organisms. Your devices emit thousands of times more.

I've been staring at a number all week: 1 microtesla.

That's the strength of the electromagnetic field that completely shut down learning ability in a living organism. To put that in perspective, your smartphone emits fields thousands of times stronger. Your WiFi router, your laptop, your wireless earbuds — all of them dwarf this number.

And yet at just 1 microtesla, researchers watched flatworms lose something fundamental: the ability to form memories.

The Experiment That Stopped Me Cold

Researchers wanted to know if theta burst electromagnetic fields could interfere with learning. They chose planaria — simple flatworms known for their remarkable regenerative abilities and, importantly, their capacity to learn basic behaviors.

The setup was straightforward: a T-maze with bright light (which planaria hate) in one arm. Over several days, the worms learned to avoid the lit arm. In the group exposed to the aversive light stimulus, arm selections for the preferred (non-light) arm decreased significantly (p < 0.001). They remembered. They adapted.

Then came the EMF-exposed group. These worms were subjected to theta burst patterns at 100 Hz, pulsed in five bursts with alternating amplitudes, at an intensity of just 1 μT. Some were exposed before the light training, some after.

None of them learned. Their arm selections remained stable throughout the experiment. The electromagnetic field didn't just slow their learning — it eliminated it entirely.

The full study, published in Bioelectromagnetics in 2025, suggests the fields disrupted "theta rhythm-dependent mechanisms that are crucial for memory encoding and retrieval."

Why Theta Rhythms Matter

Here's what makes this particularly significant: theta rhythms aren't unique to flatworms. They're universal across species...