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Titolo:
Are there discrete distal-proximal representations of the index finger andpalm in the human somatosensory cortex? A neuromagnetic study
Autore:
Hashimoto, I; Mashiko, T; Kimura, T; Imada, T;
Indirizzi:
Tokyo Inst Psychiat, Dept Psychophysiol, Setagaya Ku, Tokyo 156, Japan Tokyo Inst Psychiat Tokyo Japan 156 ysiol, Setagaya Ku, Tokyo 156, Japan Natl Inst Physiol Sci, Dept Integrat Physiol, Okazaki, Aichi 444, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 444 , Okazaki, Aichi 444, Japan NTT, Basic Res Labs, Informat Sci Res Lab, Atsugi, Kanagawa 243, Japan NTT Atsugi Kanagawa Japan 243 at Sci Res Lab, Atsugi, Kanagawa 243, Japan Tsukuba Coll Technol, Dept Acupuncture Med, Tsukuba, Ibaraki 305, Japan Tsukuba Coll Technol Tsukuba Ibaraki Japan 305 sukuba, Ibaraki 305, Japan
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 3, volume: 110, anno: 1999,
pagine: 430 - 437
SICI:
1388-2457(199903)110:3<430:ATDDRO>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
AIR-PUFF STIMULATION; GLABROUS SKIN; HUMAN HAND; PSYCHOPHYSICAL MEASUREMENTS; CUTANEOUS MECHANORECEPTORS; MAGNETIC-FIELDS; MACAQUE MONKEY; AFFERENT UNITS; RESPONSES; REORGANIZATION;
Keywords:
human; somatosensory evoked magnetic fields; somatosensory cortex; index finger; palm; distal-proximal representation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Hashimoto, I Tokyookyot Psychiat, Dept Psychophysiol, Setagaya Ku, 2-1-8 Kamikitazawa, T Tokyo Inst Psychiat 2-1-8 Kamikitazawa Tokyo Japan 156 wa, T
Citazione:
I. Hashimoto et al., "Are there discrete distal-proximal representations of the index finger andpalm in the human somatosensory cortex? A neuromagnetic study", CLIN NEU, 110(3), 1999, pp. 430-437

Abstract

Objective: The distal-proximal representations of the finger and palm in the first somatosensory cortex (SI) were studied in humans. Methods: Somatosensory evoked magnetic fields (SEFs) from 11 subjects weremeasured, following mechanical stimulation of the skin by using a 122 channel whole head SQUID system. Sensory stimulus comprising of a 10 ms vibration at the frequency of 200 Hz was delivered to 6 successive sites in 3 cm increments, along the distal-proximal direction over the volar surface of the right index finger and palm. Using a single dipole model, the sources of the magnetic fields were estimated and mapped onto magnetic resonance images of each subject. ANOVA was used for statistics. Results: Source localization was determined on the main peak (M50) of the SEFs. All of the sources were located in the area 3b of SI. Contrary to thewell-defined distal-proximal representations in the hand area of simian:SIcortex, there was no statistically significant differences between the locations of the dipoles in human SI cortex evoked by stimulation of differentsites;Conclusion: The result, however, should be interpreted with caution, because it cannot be denied that the spatial separation of sources in the distal-proximal somatotopy is beyond the resolving capacity of magnetoencephalography (MEG). In addition, at variance with the discrete distal-proximal gradient in the mechanoreceptor density, there was no statistically significantdifferences between the signal strengths of the dipoles for stimulation ofthe different locations. (C) 1999 Elsevier Science Ireland Ltd. All rightsreserved.

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Documento generato il 22/01/20 alle ore 06:32:23