By Christoph Baumgartner
The scientific electrophysiology of the human somatosensory cortex used to be investigated with a mixed procedure utilizing cortical stimulations and somatosensory evoked responses on electrocorticography, scalp-EEG, and magnetoencephalography, a brand new neurophysiological approach. The spatiotemporal constitution of the evoked reaction was once studied with novel biophysical modeling thoughts which allowed identity of the 3-dimensional intracerebral situation, time task, and interplay of the neuronal resources in human somatosensory cortex. hence, new points at the practical anatomy of the human somatosensory cortex will be elicited. moreover, the somatotopy of the hand somatosensory cortex was once investigated. Clinically, the result of comparability of the various strategies can enhance the non-invasive localization standards for basic motor and somatosensory cortex that's vital in sufferers present process neurosurgical techniques adjoining to vital fissure.
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Additional info for Clinical Electrophysiology of the Somatosensory Cortex: A Combined Study Using Electrocorticography, Scalp-EEG, and Magnetoencephalography
Either realistically brain shaped or spherical volume conductors can be assumed. Brain shaped models allow for realistic modeling of head geometry and conductivity changes. These 20 General Methodology models are more accurate. e. finite difference or finite element models, have to be employed (157,242,243,337,338]. Spherical models, on the contrary, only allow for modeling of concentric changes in conductivity. They are simpler as analytic solutions have been provided and inverse solutions can be obtained with reasonable computational effort on a personal computer [83, 84,202,337,338,369,370,372].
We used the technique proposed by Wood et al. e. to obtain reasonable start values for the non-linear minimization procedure in the multiple dipole model. 6. 1. Introduction Biophysical models have to be applied to solve the inverse problem in neurophysiology, i. e. to calculate backwards from the electric potentials or magnetic fields measured at the scalp (scalp-EEG and MEG) or on the cortical surface (EeoG) unto the three-dimensional intracerebral locations and time activities of the underlying neuronal sources.
2. Simulation Study We will demonstrate the basic principles of the spatiotemporal modeling in a simple simulation experiment on scalp-EEG. Details of this simulation experiment have been presented in a separate article . It should be noted that the conclusions of this experiment equally apply to EeoG, scalp-EEG, and MEG without any loss of generality. We placed current dipoles at different locations inside a spherical volume conductor and calculated the potentials at 49 electrode sites on the surface of the sphere thus simulating a situation that could arise in the scalpEEG.