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Titolo:
ACTIVITY IN POSTERIOR PARIETAL CORTEX FOLLOWING SOMATOSENSORY STIMULATION IN MAN - MAGNETOENCEPHALOGRAPHIC STUDY USING SPATIOTEMPORAL SOURCE ANALYSIS
Autore:
HOSHIYAMA M; KAKIGI R; KOYAMA S; WATANABE S; SHIMOJO M;
Indirizzi:
NATL INST PHYSIOL SCI,DEPT INTEGRAT PHYSIOL,MYODAIJI OKAZAKI AICHI 444 JAPAN NATL INST PHYSIOL SCI,DEPT INTEGRAT PHYSIOL OKAZAKI AICHI 444 JAPAN
Titolo Testata:
Brain topography
fascicolo: 1, volume: 10, anno: 1997,
pagine: 23 - 30
SICI:
0896-0267(1997)10:1<23:AIPPCF>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAN NERVE-STIMULATION; MAGNETIC-FIELDS; ASSOCIATION CORTEX; AWAKE MONKEYS; RHESUS-MONKEY; AREA; POTENTIALS; CONNECTIONS; RESPONSES;
Keywords:
MAGNETOENCEPHALOGRAPHY; SOMATOSENSORY STIMULATION; SPATIOTEMPORAL SOURCE ANALYSIS; PRIMARY SENSORY CORTEX; 2ND SENSORY CORTEX; POSTERIOR PARIETAL CORTEX;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
M. Hoshiyama et al., "ACTIVITY IN POSTERIOR PARIETAL CORTEX FOLLOWING SOMATOSENSORY STIMULATION IN MAN - MAGNETOENCEPHALOGRAPHIC STUDY USING SPATIOTEMPORAL SOURCE ANALYSIS", Brain topography, 10(1), 1997, pp. 23-30

Abstract

We investigated the activation of posterior parietal cortex (PPC) to somatosensory stimulation in humans to determine its fundamental role as a somatosensory associated area using magnetoencephalography (MEG). We studied somatosensory evoked magnetic fields (SEF) after stimulation of median nerve, posterior tibial nerve and lip, and analyzed them by the single dipole model and also by the multidipole model using brain electric source analysis (BESA) system. In single source model analysis, the dipole at the peak latency of short-latency components following each site stimulation were located in the corresponding receptivefields in the primary somatosensory cortex (SI) contralateral to the stimulation. The dipole at the peak latency of the middle latency components were located in bilateral upper bank of Sylvian fissure (SII). By contrast, in the five-dipole model of BESA, the equivalent current dipoles (ECDs) of the middle-latency SEF after stimulation of median nerve and posterior tibial nerve were identified in the contralateral SI and in the bilateral SII and PPC, while all activities of middle-latency SEF after lip stimulation appeared to be restricted in the contralateral SI and bilateral SII. Around 80 msec in latency, the ECD location in PPC after median nerve stimulation was, on the average, 2.4 cm posterior, 2.9 cm medial and 2.6 cm superior to the hand area in SI. The ECD in PPC after posterior tibial nerve stimulation was also located posterior to the foot area in SI, but it was close to the SI area offoot, their distance being approximately 1.3 cm. ECD in PPC was almost equally demonstrated in each hemisphere. These findings suggested that the somatosensory associated cortex in PPC represented somatotopic organization in parallel with 'homunculus' in SI, but the hand area was much wider than the foot area. It was not clear whether the lip areain PPC was absent or was too close to be separated from the SI.

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Documento generato il 08/07/20 alle ore 07:47:54