the fact that passage through the head

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What passage? The passage of waves?

Thanks in advance

Researchers have noted activity over a range of different frequencies, from delta (0.5 to 4 hertz) through to gamma (25 to 140 Hz) waves. The slowest occur during deep sleep, with increasing frequency associated with increasing levels of consciousness and concentration. Interpreting EEG data is difficult due to its poor ability to pinpoint the location of activity, and the fact that passage through the head blurs the signals. The new study, published earlier this month in Neuron, used a more recent technique called electrocorticography (ECoG).

  • Glasguensis

    Signal Modulation
    English - Scotland
    The passage of the signals. EEG works by measuring voltage variations and these measurements are made at the surface : the voltages generated by brain activity have to pass through the head to be measured.
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