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4. Electrophysiological Time-Series 231
FIGURE 11.9
A 30 s sample of high-density 256 channels EEG recording.
Fig. 11.10 shows the interpolated power distribution topography for both HD-
EEG and the standard 19-channel EEG. The significant interelectrodes distance in
the standard 10e20 configuration implies the need of interpolation with unavoidable
loss of precision. As an example, because of the interpolation effect, the two high-
power areas (red [gray in print version] areas) in the right parietal-occipital zone in
Fig. 11.10A are clustered into one in Fig. 11.10B.
FIGURE 11.10
3D scalp topography of the power of the EEG recording shown in Fig. 11.9. (A)
Topographic reconstruction achieved by taking into account all the available scalp
channels. (B) Topographic reconstruction achieved by taking into account only the
standard 19 channels.
