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6: Bad Channel Replacement For more information on the interpolation of scalp voltages, see the following sources: • Fletcher, E.M., Kussmaul, C.L., & Mangun, G.R. (1996). Estimation of interpolation errors in scalp topographic mapping. Electroencephalography and Clinical Neurophysiology, 98, 422–434. • Luu, P., Tucker, D.M., Englander, R., Lockfeld, A., Lutsep, H., & Oken, B. (2001). Localizing acute stroke-related EEG changes: Assessing the effects of spatial undersampling. Journal of Clinical Neurophysiology, 18, 302–317. • Perrin, F., Pernier, J., Bertrand, O., Giard, M., & Echallier, J.F. (1987). Mapping of scalp potentials by surface spline interpolation. Electroencephalography and Clinical Neurophysiology, 66, 75–81. • Soong, A.C.K., Lind, J.C., Shaw, G.R., & Koles, Z.J. (1993). Systematic comparisons of interpolation techniques in topographic brain mapping. Electroencephalography and Clinical Neurophysiology, 87, 185–195. • Srinivasan, R., Tucker, D.M., & Murias, M. (1998). Estimating the spatial Nyquist of the human EEG. Behavior Research Methods, Instruments, and Computers, 30, 8–19. Practice The bad channel replacement algorithm operates on good segments only. For each good segment, it replaces every sample of every channel that is bad for that segment with data interpolated from the remaining channels. It uses spherical splines as the interpolation method. This implies that channels that are marked bad for the entire recording get replaced in every good segment, whereas channels that are marked bad for a subset of the segments get replaced only in the segments in which they are bad. The Bad Channel Replacement tool never perfectly re-creates a channel. The resulting waveform is only an approximation of the signal that was present at that location on the scalp during recording. Because reconstructing a bad channel is an approximation of the actual missing data, it is limited by the spatial frequency of your electrode system and the spatial frequency of the actual underlying signal. A channel reconstructed from 64-channel data will be less accurate than one reconstructed from 128-channel data, if sufficiently high spatial frequencies are present. 70 Net Station Waveform Tools Technical Manual S-MAN-200-WFTR-001 • December 21, 2006
Bad Channel Replacement Specification Editor Net Station Waveform Tools Technical Manual S-MAN-200-WFTR-001 • December 21, 2006 6: Bad Channel Replacement Figure 6-1 shows the Bad Channel Replacement specification editor. There are no user-settable controls for this tool, except the common controls for Specification Name and Output Options (see “Specification Name and Output Options” on page 43). Figure 6-1. Bad Channel Replacement specification editor 71
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Electrical Geodesics, Inc. Net Stat
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Electrical Geodesics makes no warra
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vi Contents chapter 3 chapter 4 cha
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viii Contents chapter 18 chapter 19
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List of Figures chapter 5 Averaging
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List of Figures 17-16 Temporal rela
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List of Figures xiv Net Station Wav
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List of Tables chapter 17 Segmentat
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Preface • The Net Station Viewer
Page 20 and 21: Preface Troubleshooting, Support, a
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15: Ocular Artifact Removal The OAR
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15: Ocular Artifact Removal Table 1
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15: Ocular Artifact Removal 124 Net
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16: Script be detected only at run
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16: Script 128 Net Station Waveform
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17: Segmentation Segmentation Overv
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17: Segmentation 5 A category can c
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17: Segmentation Figure 17-8 shows
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17: Segmentation 2. Criteria pane.
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17: Segmentation Table 17-4. Criter
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17: Segmentation Criteria Sets Pane
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17: Segmentation Temporal Relations
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17: Segmentation Table 17-8. Criter
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17: Segmentation • Beyond: specif
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17: Segmentation • Generate Event
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17: Segmentation Example 2: Advance
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17: Segmentation Criteria Set 1 Cri
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17: Segmentation 164 Net Station Wa
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18: Short Epoch Filtering FIR versu
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18: Short Epoch Filtering The follo
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19: Statistic Extraction You specif
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19: Statistic Extraction 2. Add/Clo
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19: Statistic Extraction Note: By
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19: Statistic Extraction Wavelet Da
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20: T-test T-test Waveform Tool The
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20: T-test The two-cell t-test woul
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20: T-test The results are output t
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20: T-test 190 Net Station Waveform
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21: Wavelet In wavelet transformati
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21: Wavelet Net Station’s Values
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A: Software Technical Support 202 N
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B: Updating EGI Licenses Tips on Up
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B: Updating EGI Licenses Generating
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B: Updating EGI Licenses Questions
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Index E Edit menu 33 editing specif
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Index Statistic Extraction specific
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