The effects of neck flexion on cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in related sensory cortices
<p>Abstract</p> <p>Background</p> <p>A flexed neck posture leads to non-specific activation of the brain. Sensory evoked cerebral potentials and focal brain blood flow have been used to evaluate the activation of the sensory cortex. We investigated the effects of a flex...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2012-12-01
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| Series: | Journal of Physiological Anthropology |
| Subjects: | |
| Online Access: | http://www.jphysiolanthropol.com/content/31/1/31 |
| _version_ | 1818381712762077184 |
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| author | Fujiwara Katsuo Kunita Kenji Kiyota Naoe Mammadova Aida Irei Mariko |
| author_facet | Fujiwara Katsuo Kunita Kenji Kiyota Naoe Mammadova Aida Irei Mariko |
| author_sort | Fujiwara Katsuo |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>A flexed neck posture leads to non-specific activation of the brain. Sensory evoked cerebral potentials and focal brain blood flow have been used to evaluate the activation of the sensory cortex. We investigated the effects of a flexed neck posture on the cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in the related sensory cortices.</p> <p>Methods</p> <p>Twelve healthy young adults received right visual hemi-field, binaural auditory and left median nerve stimuli while sitting with the neck in a resting and flexed (20° flexion) position. Sensory evoked potentials were recorded from the right occipital region, Cz in accordance with the international 10–20 system, and 2 cm posterior from C4, during visual, auditory and somatosensory stimulations. The oxidative-hemoglobin concentration was measured in the respective sensory cortex using near-infrared spectroscopy.</p> <p>Results</p> <p>Latencies of the late component of all sensory evoked potentials significantly shortened, and the amplitude of auditory evoked potentials increased when the neck was in a flexed position. Oxidative-hemoglobin concentrations in the left and right visual cortices were higher during visual stimulation in the flexed neck position. The left visual cortex is responsible for receiving the visual information. In addition, oxidative-hemoglobin concentrations in the bilateral auditory cortex during auditory stimulation, and in the right somatosensory cortex during somatosensory stimulation, were higher in the flexed neck position.</p> <p>Conclusions</p> <p>Visual, auditory and somatosensory pathways were activated by neck flexion. The sensory cortices were selectively activated, reflecting the modalities in sensory projection to the cerebral cortex and inter-hemispheric connections.</p> |
| first_indexed | 2024-12-14T02:38:56Z |
| format | Article |
| id | doaj.art-ea19a71ee5ba4d4b8a7bb653d37b4bed |
| institution | Directory Open Access Journal |
| issn | 1880-6791 1880-6805 |
| language | English |
| last_indexed | 2024-12-14T02:38:56Z |
| publishDate | 2012-12-01 |
| publisher | BMC |
| record_format | Article |
| series | Journal of Physiological Anthropology |
| spelling | doaj.art-ea19a71ee5ba4d4b8a7bb653d37b4bed2022-12-21T23:20:03ZengBMCJournal of Physiological Anthropology1880-67911880-68052012-12-013113110.1186/1880-6805-31-31The effects of neck flexion on cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in related sensory corticesFujiwara KatsuoKunita KenjiKiyota NaoeMammadova AidaIrei Mariko<p>Abstract</p> <p>Background</p> <p>A flexed neck posture leads to non-specific activation of the brain. Sensory evoked cerebral potentials and focal brain blood flow have been used to evaluate the activation of the sensory cortex. We investigated the effects of a flexed neck posture on the cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in the related sensory cortices.</p> <p>Methods</p> <p>Twelve healthy young adults received right visual hemi-field, binaural auditory and left median nerve stimuli while sitting with the neck in a resting and flexed (20° flexion) position. Sensory evoked potentials were recorded from the right occipital region, Cz in accordance with the international 10–20 system, and 2 cm posterior from C4, during visual, auditory and somatosensory stimulations. The oxidative-hemoglobin concentration was measured in the respective sensory cortex using near-infrared spectroscopy.</p> <p>Results</p> <p>Latencies of the late component of all sensory evoked potentials significantly shortened, and the amplitude of auditory evoked potentials increased when the neck was in a flexed position. Oxidative-hemoglobin concentrations in the left and right visual cortices were higher during visual stimulation in the flexed neck position. The left visual cortex is responsible for receiving the visual information. In addition, oxidative-hemoglobin concentrations in the bilateral auditory cortex during auditory stimulation, and in the right somatosensory cortex during somatosensory stimulation, were higher in the flexed neck position.</p> <p>Conclusions</p> <p>Visual, auditory and somatosensory pathways were activated by neck flexion. The sensory cortices were selectively activated, reflecting the modalities in sensory projection to the cerebral cortex and inter-hemispheric connections.</p>http://www.jphysiolanthropol.com/content/31/1/31Brain activationFocal brain blood flowNear-infrared spectroscopyNeck flexionSensory evoked potential |
| spellingShingle | Fujiwara Katsuo Kunita Kenji Kiyota Naoe Mammadova Aida Irei Mariko The effects of neck flexion on cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in related sensory cortices Journal of Physiological Anthropology Brain activation Focal brain blood flow Near-infrared spectroscopy Neck flexion Sensory evoked potential |
| title | The effects of neck flexion on cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in related sensory cortices |
| title_full | The effects of neck flexion on cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in related sensory cortices |
| title_fullStr | The effects of neck flexion on cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in related sensory cortices |
| title_full_unstemmed | The effects of neck flexion on cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in related sensory cortices |
| title_short | The effects of neck flexion on cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in related sensory cortices |
| title_sort | effects of neck flexion on cerebral potentials evoked by visual auditory and somatosensory stimuli and focal brain blood flow in related sensory cortices |
| topic | Brain activation Focal brain blood flow Near-infrared spectroscopy Neck flexion Sensory evoked potential |
| url | http://www.jphysiolanthropol.com/content/31/1/31 |
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