ECOG Electrocorticography iEEG ICOG
<p>Jun 25, 2009 10:30 AM
 
ECoG signals are composed of synchronized postsynaptic potentials (local field potentials), recorded directly from the exposed surface of the cortex. The potentials occur primarily in cortical <a class="mw-redirect" href="/wiki/Pyramidal_cells" title="Pyramidal cells">pyramidal cells</a>,
 
ECoG offers a temporal resolution of approximately 5 ms and a spatial resolution of 1 cm.
 
Using depth electrodes, the <a href="/wiki/Local_field_potential" title="Local field potential">local field potential</a> gives a measure of a neural population in a sphere with a radius of 0.5-3 mm around the tip of the electrode. <a href="#cite_note-Logothetis_2003-4"><sup id="cite_ref-Logothetis2003_4-0" class="reference">[5]</sup></a> With a sufficiently high sampling rate (more than about 10 kHz), depth electrodes can also measure <a class="mw-redirect" href="/wiki/Action_potentials" title="Action potentials">action potentials</a>. <a href="#cite_note-Ulbert_2001-5"><sup id="cite_ref-Ulbert_2001_5-0" class="reference">[6]</sup></a> In which case the spatial resolution is down to individual neurons, and the field of view of an individual electrode is approximately 0.05-0.35 mm.<a href="#cite_note-Logothetis_2003-4"><sup id="cite_ref-Logothetis2003_4-1" class="reference">[5]</sup></a>
 
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