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)) .