Abstract
The EEG and ECoG consist of collections of time series that are recorded from arrays of electrodes placed, respectively, on the scalp or surface of the cortex. Local field potentials, LFP, are recordings from penetrating electrodes deep in cortex and the brain. The surface potential differences are caused by flows of dendritic currents from cortical neurons that are oriented perpendicularly to the surface of recording. The dendritic currents are produced by chemical reactions in synapses that are turned on briefly by pulses carried by incoming axons forming the synapses (Fig. 6.1, Sect. 6.2). The same currents regulate the probability of pulses on outgoing axons of the neurons integrating the pulse input. The macroscopic operations of cortex transform microscopic spatial patterns of incoming pulses to spatial patterns of outgoing pulse vector fields, which carry patterns that are revealed by images in the EEG and ECoG.
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Freeman, W.J., Quiroga, R.Q. (2013). Image Sampling Based on Spectral Analysis. In: Imaging Brain Function With EEG. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4984-3_7
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