Electrocorticography
Recording electrical activity from the brain surface using grid or strip electrodes placed epidurally or subdurally.
Electrocorticography (ECoG) records electrical activity from the brain surface using grid or strip electrodes placed epidurally (on top of the dura) or subdurally (beneath the dura, directly on the cortex).
Why it matters: ECoG provides higher spatial resolution and signal quality than scalp EEG while being less invasive than penetrating probes. It is used in both clinical neurosurgery (epilepsy mapping) and research (brain-machine interfaces, sensorimotor mapping).
Signal characteristics: ECoG captures local field potentials with bandwidth up to several hundred Hz, including high-gamma activity (70–200 Hz) that is not accessible with scalp EEG.
NeuroNexus products: Thin-film grid electrodes provide flexible, high-density ECoG arrays for both acute and chronic surface recordings.