Academic Journal
fMRI responses in medial frontal cortex that depend on the temporal frequency of visual input.
| العنوان: | fMRI responses in medial frontal cortex that depend on the temporal frequency of visual input. |
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| المؤلفون: | Srinivasan, R., Fornari, E., Knyazeva, M.G., Meuli, R., Maeder, P. |
| المصدر: | Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale, vol. 180, no. 4, pp. 677-691 |
| سنة النشر: | 2007 |
| المجموعة: | Université de Lausanne (UNIL): Serval - Serveur académique lausannois |
| مصطلحات موضوعية: | Adult, Brain Mapping, Electroencephalography, Evoked Potentials, Visual/physiology, Female, Frontal Lobe/anatomy & histology, Frontal Lobe/physiology, Humans, Image Processing, Computer-Assisted, Magnetic Resonance Imaging/methods, Male, Nerve Net/anatomy & histology, Nerve Net/physiology, Neuropsychological Tests, Pattern Recognition, Photic Stimulation, Time Factors, Visual Cortex/anatomy & histology, Visual Cortex/physiology, Visual Pathways/anatomy & histology, Visual Pathways/physiology |
| الوصف: | Functional networks in the human brain have been investigated using electrophysiological methods (EEG/MEG, LFP, and MUA) and steady-state paradigms that apply periodic luminance or contrast modulation to drive cortical networks. We have used this approach with fMRI to characterize a cortical network driven by a checkerboard reversing at a fixed frequency. We found that the fMRI signals in voxels located in occipital cortex were increased by checkerboard reversal at frequencies ranging from 3 to 14 Hz. In contrast, the response of a cluster of voxels centered on basal medial frontal cortex depended strongly on the reversal frequency, consistently exhibiting a peak in the response for specific reversal frequencies between 3 and 5 Hz in each subject. The fMRI signals at the frontal voxels were positively correlated indicating a homogeneous cluster. Some of the occipital voxels were positively correlated to the frontal voxels apparently forming a large-scale functional network. Other occipital voxels were negatively correlated to the frontal voxels, suggesting a functionally distinct network. The results provide preliminary fMRI evidence that during visual stimulation, input frequency can be varied to engage different functional networks. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/pmid/17297549; info:eu-repo/semantics/altIdentifier/pissn/0014-4819; info:eu-repo/semantics/altIdentifier/urn/urn:nbn:ch:serval-BIB_D3310131D3920; https://serval.unil.ch/notice/serval:BIB_D3310131D392; https://serval.unil.ch/resource/serval:BIB_D3310131D392.P001/REF.pdf |
| DOI: | 10.1007/s00221-007-0886-3 |
| الاتاحة: | https://serval.unil.ch/notice/serval:BIB_D3310131D392 https://doi.org/10.1007/s00221-007-0886-3 https://serval.unil.ch/resource/serval:BIB_D3310131D392.P001/REF.pdf http://nbn-resolving.org/urn/resolver.pl?urn=urn:nbn:ch:serval-BIB_D3310131D3920 |
| Rights: | info:eu-repo/semantics/openAccess ; Copying allowed only for non-profit organizations ; https://serval.unil.ch/disclaimer |
| رقم الانضمام: | edsbas.D89CCD3D |
| قاعدة البيانات: | BASE |
| DOI: | 10.1007/s00221-007-0886-3 |
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