This isn't hypothetical: hospitals measure your frequencies every day. An EEG reads your brainwaves in hertz. An EKG reads the electrical rhythm of your heart. Researchers can even watch your brain respond to a single word, milliseconds before you're conscious of it.
These references show exactly what gets measured, how, and what the numbers mean.
How brainwaves are recorded, from the National Library of Medicine.
The deeper science of the brain's rhythms, from 0.5 Hz sleep waves to 100 Hz bursts. Read the studies yourself.
The clinician's reference, free on the National Library of Medicine.
Reading the heart's electrical signal: the original body-frequency measurement.
Why the spacing between heartbeats tracks stress, recovery, and nervous system state.
The measurable brain wave that fires ~400 ms after a word, before conscious thought catches up. The definitive review.
The general method for catching the brain's electrical answer to a stimulus.