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Titolo:
Attention and visual interference stimulation affect somatosensory processing: A magnetoencephalographic study
Autore:
Lam, K; Kakigi, R; Mukai, T; Yamasaki, H;
Indirizzi:
Natl Inst Physiol Sci, Dept Integrat Physiol, Okazaki, Aichi 4448585, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 4448585 i, Aichi 4448585, Japan Oita Med Univ, Dept Internal Med 1, Oita, Japan Oita Med Univ Oita Japan ita Med Univ, Dept Internal Med 1, Oita, Japan
Titolo Testata:
NEUROSCIENCE
fascicolo: 3, volume: 104, anno: 2001,
pagine: 689 - 703
SICI:
0306-4522(2001)104:3<689:AAVISA>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVOKED MAGNETIC-FIELDS; MEDIAN NERVE-STIMULATION; CORTICO-CORTICAL CONNECTIONS; FUNCTIONAL PROPERTIES; PARIETAL CORTEX; AWAKE MONKEYS; HUMAN BRAIN; AREA 7; ACTIVATION; POTENTIALS;
Keywords:
somatosensory evoked magnetic field; visual stimulation; auditory stimulation; interference; attention; magnetoencephalography;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Lam, K Natl Inst Physiol Sci, Dept Integrat Physiol, Okazaki, Aichi 4448585, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 4448585 i 4448585, Japan
Citazione:
K. Lam et al., "Attention and visual interference stimulation affect somatosensory processing: A magnetoencephalographic study", NEUROSCIENC, 104(3), 2001, pp. 689-703

Abstract

In our previous study. continuous visual (cartoon and random dot motion) and auditor); (music) stimulation changed the somatosensory evoked magnetic fields following electrical stimulation of the median nerve in human subjects. They enhanced the middle-latency components (3M and 4M) generated in the contralateral primary somatosensory cortex, and reduced the MI component generated in the ipsilateral secondary somatosensory cortex. We speculated that such interference effects were caused by activation of polymodal neurons in areas 5 and/or 7 of the parietal lobe as well as in the medial superior temporal region and superior temporal sulcus. However. we could not exclude the effect of attention on such interference effects. In the present study, to know the effect of attention on visual and auditory interference inthese changes, we stimulated the bilateral median nerves unilaterally in arandom order, and asked subjects to count the number of times the left median nerve was stimulated while visual or auditory interference was applied. Five components (1M-5M) were identified in the hemisphere contralateral tothe stimulated nerve and only one component (MI) was found in the ipsilateral hemisphere. The 3M and 3M components (33-75 ms in latency) were enhanced by both attention and visual interference stimulation but not by auditorystimulation. The 5M component(70-115 ms) and MI component (70-133 ms) wereenhanced by attention, bur were not changed by attention together with visual or auditory interference. Summarizing the results of our previous studyand the present study. (1) visual interference alone enhanced the 3M and 4M but reduced the MI. and (2) attention alone also enhanced the 3M and 4M. and enhanced the 5M and MI. As a result. (3) visual interference with attention enhanced the 3M and 3M more, and showed no significant change of the 5M and MI. This was compatible with a summation of the effects caused by visual interference alone and attention alone, but some interactions between visual interference and attention might have taken place. The locations of dipoles of all components were not significantly changed by attention or anyinterference stimulation. These findings support the idea that there are significant interactions ofactivities relating to somatosensory stimulation, visual stimulation and cognitive function, in both the primary and the secondary somatosensory cortex in humans. (C) 2001 IBRO. Published by Elsevier Science Ltd. All rights reserved.

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Documento generato il 29/01/20 alle ore 18:55:19