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Titolo:
NEUROMAGNETIC STUDIES OF THE LIP AREA OF PRIMARY SOMATOSENSORY CORTEXIN HUMANS - EVIDENCE FOR AN OSCILLOTOPIC ORGANIZATION
Autore:
MOGILNER A; NOMURA M; RIBARY U; JAGOW R; LADO F; RUSINEK H; LLINAS R;
Indirizzi:
NYU,MED CTR,DEPT PHYSIOL & BIOPHYS,CTR NEUROMAGNETISM,550 1ST AVE NEWYORK NY 10016 NYU,MED CTR,DEPT PHYSIOL & BIOPHYS,CTR NEUROMAGNETISM NEW YORK NY 10016 NYU,MED CTR,DEPT RADIOL NEW YORK NY 10016
Titolo Testata:
Experimental Brain Research
fascicolo: 1, volume: 99, anno: 1994,
pagine: 137 - 147
SICI:
0014-4819(1994)99:1<137:NSOTLA>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN AUDITORY-CORTEX; TRIGEMINAL EVOKED-POTENTIALS; CEREBRAL MAGNETIC-FIELDS; CORTICAL RESPONSES; PSYCHOPHYSICAL MEASUREMENTS; ELECTRICAL-STIMULATION; TONOTOPIC ORGANIZATION; NERVE-STIMULATION; NEURONAL-ACTIVITY; HUMAN-BRAIN;
Keywords:
MAGNETOENCEPHALOGRAPHY; SOMATOSENSORY CORTEX; TRIGEMINAL NERVE; LIP; FREQUENCY DISCRIMINATION; HUMAN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
67
Recensione:
Indirizzi per estratti:
Citazione:
A. Mogilner et al., "NEUROMAGNETIC STUDIES OF THE LIP AREA OF PRIMARY SOMATOSENSORY CORTEXIN HUMANS - EVIDENCE FOR AN OSCILLOTOPIC ORGANIZATION", Experimental Brain Research, 99(1), 1994, pp. 137-147

Abstract

Magnetic trigeminal somatosensory responses from human subjects were recorded using a 14-channel magnetoencephalographic system. Sensory stimuli comprising a 15-ms vibration at frequencies of 50 Hz, 150 Hz and250 Hz were given at randomized interstimulus intervals. Using a single dipole model, the neuronal sources of the evoked responses were determined, and mapped onto magnetic resonance images of each subject. Source localization analysis was based on the main peak of the averaged signal (M55). All of the sources were located deep in the anterior bank of the postcentral gyrus, corresponding to area 3b of somatosensory cortex SI. In all cases, the source for the upper lip was significantly higher in the vertical axis (0.6-1.1 cm) than for the lower lip, while the lower lip stimulation produced a larger response than the upperlip. Furthermore, statistically significant differences were found between the locations of the dipoles evoked by different frequency stimulation. The location of the response shifted with change in stimulation frequency, showing a trend among all subjects with a medial shift between 150 and 250 Hz for both upper and lower lip. The accuracy of source localization calculated from magnetic fields ranged between +/-0.9and +/-3.0 mm (SEM). These results demonstrate (1) that a large area of the somatosensory cortex is utilized for lip representation and (2)that the spatial displacement of the trigeminal somatosensory response may be related to the discrimination of frequency.

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Documento generato il 12/07/20 alle ore 01:39:43