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Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans
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| Zeitschriftentitel: | Journal of Neurophysiology |
|---|---|
| Personen und Körperschaften: | , , , , , |
| In: | Journal of Neurophysiology, 82, 1999, 6, S. 3095-3107 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Physiological Society
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| Schlagwörter: |
| author_facet |
Knyazeva, M. G. Kiper, D. C. Vildavski, V. Y. Despland, P. A. Maeder-Ingvar, M. Innocenti, G. M. Knyazeva, M. G. Kiper, D. C. Vildavski, V. Y. Despland, P. A. Maeder-Ingvar, M. Innocenti, G. M. |
|---|---|
| author |
Knyazeva, M. G. Kiper, D. C. Vildavski, V. Y. Despland, P. A. Maeder-Ingvar, M. Innocenti, G. M. |
| spellingShingle |
Knyazeva, M. G. Kiper, D. C. Vildavski, V. Y. Despland, P. A. Maeder-Ingvar, M. Innocenti, G. M. Journal of Neurophysiology Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans Physiology General Neuroscience |
| author_sort |
knyazeva, m. g. |
| spelling |
Knyazeva, M. G. Kiper, D. C. Vildavski, V. Y. Despland, P. A. Maeder-Ingvar, M. Innocenti, G. M. 0022-3077 1522-1598 American Physiological Society Physiology General Neuroscience http://dx.doi.org/10.1152/jn.1999.82.6.3095 <jats:p> We analyzed the coherence of electroencephalographic (EEG) signals recorded symmetrically from the two hemispheres, while subjects ( n = 9) were viewing visual stimuli. Considering the many common features of the callosal connectivity in mammals, we expected that, as in our animal studies, interhemispheric coherence (ICoh) would increase only with bilateral iso-oriented gratings located close to the vertical meridian of the visual field, or extending across it. Indeed, a single grating that extended across the vertical meridian significantly increased the EEG ICoh in normal adult subjects. These ICoh responses were obtained from occipital and parietal derivations and were restricted to the gamma frequency band. They were detectable with different EEG references and were robust across and within subjects. Other unilateral and bilateral stimuli, including identical gratings that were effective in anesthetized animals, did not affect ICoh in humans. This fact suggests the existence of regulatory influences, possibly of a top-down kind, on the pattern of callosal activation in conscious human subjects. In addition to establishing the validity of EEG coherence analysis for assaying cortico-cortical connectivity, this study extends to the human brain the finding that visual stimuli cause interhemispheric synchronization, particularly in frequencies of the gamma band. It also indicates that the synchronization is carried out by cortico-cortical connection and suggests similarities in the organization of visual callosal connections in animals and in man. </jats:p> Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans Journal of Neurophysiology |
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| title |
Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans |
| title_unstemmed |
Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans |
| title_full |
Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans |
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Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans |
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Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans |
| title_short |
Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans |
| title_sort |
visual stimulus–dependent changes in interhemispheric eeg coherence in humans |
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Physiology General Neuroscience |
| url |
http://dx.doi.org/10.1152/jn.1999.82.6.3095 |
| publishDate |
1999 |
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3095-3107 |
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<jats:p> We analyzed the coherence of electroencephalographic (EEG) signals recorded symmetrically from the two hemispheres, while subjects ( n = 9) were viewing visual stimuli. Considering the many common features of the callosal connectivity in mammals, we expected that, as in our animal studies, interhemispheric coherence (ICoh) would increase only with bilateral iso-oriented gratings located close to the vertical meridian of the visual field, or extending across it. Indeed, a single grating that extended across the vertical meridian significantly increased the EEG ICoh in normal adult subjects. These ICoh responses were obtained from occipital and parietal derivations and were restricted to the gamma frequency band. They were detectable with different EEG references and were robust across and within subjects. Other unilateral and bilateral stimuli, including identical gratings that were effective in anesthetized animals, did not affect ICoh in humans. This fact suggests the existence of regulatory influences, possibly of a top-down kind, on the pattern of callosal activation in conscious human subjects. In addition to establishing the validity of EEG coherence analysis for assaying cortico-cortical connectivity, this study extends to the human brain the finding that visual stimuli cause interhemispheric synchronization, particularly in frequencies of the gamma band. It also indicates that the synchronization is carried out by cortico-cortical connection and suggests similarities in the organization of visual callosal connections in animals and in man. </jats:p> |
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| author | Knyazeva, M. G., Kiper, D. C., Vildavski, V. Y., Despland, P. A., Maeder-Ingvar, M., Innocenti, G. M. |
| author_facet | Knyazeva, M. G., Kiper, D. C., Vildavski, V. Y., Despland, P. A., Maeder-Ingvar, M., Innocenti, G. M., Knyazeva, M. G., Kiper, D. C., Vildavski, V. Y., Despland, P. A., Maeder-Ingvar, M., Innocenti, G. M. |
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| description | <jats:p> We analyzed the coherence of electroencephalographic (EEG) signals recorded symmetrically from the two hemispheres, while subjects ( n = 9) were viewing visual stimuli. Considering the many common features of the callosal connectivity in mammals, we expected that, as in our animal studies, interhemispheric coherence (ICoh) would increase only with bilateral iso-oriented gratings located close to the vertical meridian of the visual field, or extending across it. Indeed, a single grating that extended across the vertical meridian significantly increased the EEG ICoh in normal adult subjects. These ICoh responses were obtained from occipital and parietal derivations and were restricted to the gamma frequency band. They were detectable with different EEG references and were robust across and within subjects. Other unilateral and bilateral stimuli, including identical gratings that were effective in anesthetized animals, did not affect ICoh in humans. This fact suggests the existence of regulatory influences, possibly of a top-down kind, on the pattern of callosal activation in conscious human subjects. In addition to establishing the validity of EEG coherence analysis for assaying cortico-cortical connectivity, this study extends to the human brain the finding that visual stimuli cause interhemispheric synchronization, particularly in frequencies of the gamma band. It also indicates that the synchronization is carried out by cortico-cortical connection and suggests similarities in the organization of visual callosal connections in animals and in man. </jats:p> |
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| spelling | Knyazeva, M. G. Kiper, D. C. Vildavski, V. Y. Despland, P. A. Maeder-Ingvar, M. Innocenti, G. M. 0022-3077 1522-1598 American Physiological Society Physiology General Neuroscience http://dx.doi.org/10.1152/jn.1999.82.6.3095 <jats:p> We analyzed the coherence of electroencephalographic (EEG) signals recorded symmetrically from the two hemispheres, while subjects ( n = 9) were viewing visual stimuli. Considering the many common features of the callosal connectivity in mammals, we expected that, as in our animal studies, interhemispheric coherence (ICoh) would increase only with bilateral iso-oriented gratings located close to the vertical meridian of the visual field, or extending across it. Indeed, a single grating that extended across the vertical meridian significantly increased the EEG ICoh in normal adult subjects. These ICoh responses were obtained from occipital and parietal derivations and were restricted to the gamma frequency band. They were detectable with different EEG references and were robust across and within subjects. Other unilateral and bilateral stimuli, including identical gratings that were effective in anesthetized animals, did not affect ICoh in humans. This fact suggests the existence of regulatory influences, possibly of a top-down kind, on the pattern of callosal activation in conscious human subjects. In addition to establishing the validity of EEG coherence analysis for assaying cortico-cortical connectivity, this study extends to the human brain the finding that visual stimuli cause interhemispheric synchronization, particularly in frequencies of the gamma band. It also indicates that the synchronization is carried out by cortico-cortical connection and suggests similarities in the organization of visual callosal connections in animals and in man. </jats:p> Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans Journal of Neurophysiology |
| spellingShingle | Knyazeva, M. G., Kiper, D. C., Vildavski, V. Y., Despland, P. A., Maeder-Ingvar, M., Innocenti, G. M., Journal of Neurophysiology, Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans, Physiology, General Neuroscience |
| title | Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans |
| title_full | Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans |
| title_fullStr | Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans |
| title_full_unstemmed | Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans |
| title_short | Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans |
| title_sort | visual stimulus–dependent changes in interhemispheric eeg coherence in humans |
| title_unstemmed | Visual Stimulus–Dependent Changes in Interhemispheric EEG Coherence in Humans |
| topic | Physiology, General Neuroscience |
| url | http://dx.doi.org/10.1152/jn.1999.82.6.3095 |