In a study published in 1975 in the Annals of the New York Academy of Sciences, Frey reported that microwaves pulsed at certain modulations could induce “leakage” in the barrier between the circulatory system and the brain. Breaching the blood-brain barrier is a serious matter: It means the brain’s environment, which needs to be extremely stable for nerve cells to function properly, can be perturbed in all kinds of dangerous ways. Frey’s method was rather simple: He injected a fluorescent dye into the circulatory system of white rats, then swept the ­microwave frequencies across their bodies. In a matter of minutes, the dye had leached into the confines of the rats’ brains.

A Swedish neurosurgeon, Leif Salford, recently expanded on Frey’s work, confirming much of what Frey revealed decades ago. Salford found that microwave exposure killed rodents’ brain cells and stimulated neurons associated with Alzheimer’s. “A rat’s brain is very much the same as a human’s,” he said in a 2003 interview with the BBC. “They have the same blood-brain barrier and neurons. We have good reason to believe that what happens in rats’ brains also happens in humans’. ” His research, he said, suggests that “a whole generation of [cell-phone] users may suffer negative effects in middle age.”

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