title: Human short latency cortical responses to somatosensory stimulation. A high resolution EEG study.
abstract: Human short-latency cortical responses to median nerve stimulation were investigated with a new high resolution electroencephalography technology that markedly enhanced spatial details of somatosensory-evoked potentials (SEPs). Maximum amplitude potentials were estimated over contralateral and/or frontal-mesial scalp regions about 20, 22, 24, 26, 30, 32 and 45 ms following the stimulation. Frontal-lateral P20-N24-N30-P45 and parietal-lateral N20-P24-P30-N45 showed dipolar patterns, whereas frontal-mesial N24-N30-P45 and central-lateral P22-N26-N32-P45 presented no clearcut dipole counterpart. Plausibly, the spatially enhanced frontal-parietal SEP components were generated (tangential dipoles) within the lateral central sulcus cortex, and anticipated the central-lateral and frontal-mesial components generated (radial dipoles) from the crown of the pre- and/or post-central gyri and the supplementary motor area, respectively.
authors.affiliation: Institute of Human Physiology, Division of High Resolution EEG (CIMS), University of Rome La Sapienza.
authors.forename: A
authors.initials: A
authors.lastname: Urbano
authors.forename: F
authors.initials: F
authors.lastname: Babiloni
authors.forename: C
authors.initials: C
authors.lastname: Babiloni
authors.forename: A
authors.initials: A
authors.lastname: Ambrosini
authors.forename: P
authors.initials: P
authors.lastname: Onorati
authors.forename: P M
authors.initials: PM
authors.lastname: Rossini
mesh_terms: D002540:Cerebral Cortex / Q000502:physiology*; D004558:Electric Stimulation; D004569:Electroencephalography; D005073:Evoked Potentials, Somatosensory / Q000502:physiology*; D006801:Humans; D008475:Median Nerve / Q000502:physiology; D017397:Prefrontal Cortex / Q000502:physiology