ABSTRACT
The signal recorded with EEG is a representation of voltage §uctuations in space and time, the electrical potentials arising from summated excitatory and inhibitory postsynaptic potentials that are generated mainly by cortical pyramidal cells (Gloor 1985; Pedley and Traub 1990; Lopes da Silva and Van Rotterdam 1993; Speckmann and Elger 1993). “Synchronous” neural activity involving at
2.1 Introduction ............................................................................................................................23 2.2 Generation of the Potentials Recorded with EEG ..................................................................23 2.3 Types of Potentials Recorded with EEG ................................................................................25 2.4 EEG Recording Conventions ..................................................................................................26 2.5 EEG Examples ........................................................................................................................28 2.6 Artifacts and Reference Electrodes ........................................................................................28 2.7 Limitations of Scalp EEG Recording ..................................................................................... 35 2.8 Intracranial EEG ..................................................................................................................... 37 References ........................................................................................................................................ 38
least 6 cm2 of cortex is considered necessary for detection with scalp EEG (Cooper et al. 1965), and pathological epileptiform potentials typically involve larger cortical areas extending over at least 10-20 cm2 (Tao et al. 2005).
