Weak RF fields (450 MHz) that were sinusoidally modulated at 16 Hz increased the efflux of calcium ion from freshly isolated chick brain. The data demonstrate upper and lower bounds for power levels of incident fields at which the change of efflux is observed. These bounds, > 0.05 mW cm−2 and < 2.0 mW cm−2, constitute an amplitude window for the calcium-efflux effect, which is also characterized by a frequency window demonstrated in previous experiments. The mechanisms by which weak low-frequency fields—or weak high-frequency fields modulated at sub-ELF rates—interact with biological tissue derive from the properties of the biological components of neuronal membrane and from the unique dielectric properties of biological tissues in fields that oscillate at brain-wave frequencies.
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