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First of all, notice that baseline results are much lower than in the DMN case because in this configuration different source orientations can not be processed in an effective way due to the limited spatial extent of the microphone array.
Therefore, it is possible that all source orientations generate a magnetic field that is detectable by MEG.
Since the dipole source orientations were fixed, there was only one dipole strength which needed to be specified for each dipole location.
The source orientations with the lowest and the highest sensitivity were determined with the help of the singular value decomposition (SVD).
The sensitivity of MEG and EEG for three orthogonal source orientations at each location on the cortex is shown in Fig. 2.
Neuronal current sources underlying single-trial MEG and EEG signals were estimated using linear minimum-norm estimates with fixed cortical source orientations.
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To better understand the effect of source orientation on source localization, three orthogonal (x, y, z oriented) simulated dipoles were placed at each grid location.
It was found that information gleaned from the direct fluid path arrival may have the potential for aiding Modal Acoustic Emission practices in source mechanism identification, determination of source orientation, as well as source depth estimation.
The source and the microphone can be located anywhere within the room, while the source orientation is distributed between −π and π.
We were able to reproduce the variations seen in the flood B data by changing the source orientation and stacking order of the flood phantoms, shown in Fig. 2.
For EEG, the sensitivity depended on the source orientation much less than for MEG.
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