Research Article

The Influence of Age and Skull Conductivity on Surface and Subdermal Bipolar EEG Leads

Figure 3

Measurement sensitivity distributions of the Visible Human Man mapped in the logarithmic scale: ((a)–(d)) surface electrodes placed on the scalp solved according to the scalp-to-skull conductivity ratio mentioned in the subcaption and ((e)–(h)) subdermal insulated needle electrodes inserted through the skin placing the measuring tip on the skull surface solved according to the scalp-to-skull conductivity ratio mentioned in the subcaption. Scalp-to-skull conductivity ratios are specified in each subcaption: ((a), (e)) , ((b), (f)) , ((c), (g)) , and ((d), (h)) .
397272.fig.003a
(a) Surface,
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(b) Surface,
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(c) Surface,
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(d) Surface,
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(e) Subdermal,
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(f) Subdermal,
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(g) Subdermal,
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(h) Subdermal,