Principles of Topographic Analyses for Electrical Neuroimaging
Principles of Topographic Analyses for Electrical Neuroimaging
This chapter presents a new approach to topographic mapping using reference-independent spatial information in high-density electrode montages, and analyzes the pitfalls and limitations of analyzing event-related potential (ERP) voltage waveforms due to their being dependent on the choice of the reference electrode(s). It reports the methods for identifying and quantifying topographic modulations. The chapter shows that the analysis used for identifying the periods of topographic stability within and between experimental conditions serves to determine the sequence, duration, and explanatory power of the “letters” in the ERP. It suggests that information-rich analyses can be easy to use and interpret.
Keywords: topographic mapping, event-related potential, voltage waveforms, topographic stability, electrode montages, spatial information
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