Multichannel EEG fields during and without visual input: frequency domain model source locations and dimensional complexities

• Published in: Neuroscience letters Vol. 226; no. 1; pp. 49 - 52
• Main Authors: Kondakor, I, Brandeis, D, Wackermann, J, Kochi, K, Koenig, T, Frei, E, Pascual-Marqui, R.D, Yagyu, T, Lehmann, D
• Format: Journal Article
• Language: English
• Published: Shannon Elsevier Ireland Ltd 18-04-1997; Elsevier
• Subjects: Adult; Biological and medical sciences; Brain - physiology; Brain electric field; Central nervous system; Dimensional complexity; Electroencephalography; Electrophysiology; Eye Movements - physiology; Female; FFT-Dipole-Approximation; fMRI; Frequency domain source localization; Fundamental and applied biological sciences. Psychology; Humans; Male; Models, Neurological; PET; Photic Stimulation; Vertebrates: nervous system and sense organs; Visual input; fMRI; Brain electric field; Visual input; FFT-Dipole-Approximation; Dimensional complexity; Frequency domain source localization; PET; Human; Multichannel recording; Vision; Central nervous system; Electrophysiology; Frequency domain method; Electroencephalography; Light stimulus; Brain (vertebrata)
• ISSN: 0304-3940; 1872-7972
• DOI: 10.1016/S0304-3940(97)00224-3

27-Channel EEG potential map series were recorded from 12 normals with closed and open eyes. Intracerebral dipole model source locations in the frequency domain were computed. Eye opening (visual input) caused centralization (convergence and elevation) of the source locations of the seven frequency bands, indicative of generalized activity; especially, there was clear anteriorization of
α-2 (10.5–12 Hz) and
β-2 (18.5–21 Hz) sources (
α-2 also to the left). Complexity of the map series' trajectories in state space (assessed by Global Dimensional Complexity and Global OMEGA Complexity) increased significantly with eye opening, indicative of more independent, parallel, active processes. Contrary to PET and fMRI, these results suggest that brain activity is more distributed and independent during visual input than after eye closing (when it is more localized and more posterior).