Time, frequency and volumetric differences of high-frequency neuromagnetic oscillation between left and right somatosensory cortices

Volumetric imaging of brain activity with spatial-frequency decoding of neuromagnetic signals

“…Second, high-frequency signals are relatively weak and appear only in nearby sensors. This feature seems to be a problem in localizing sources using all-sensor-approach (Gummadavelli et al, 2013;Kotecha et al, 2009b). Building on previous reports (Popescu et al, 2008), it is an advantage for the new method due to its usage of optimized LB sensors, which automatically minimized the interferences of two sources by combining PSC and CSRS.…”

“…Similar to previous reports Gummadavelli et al, 2013;Kotecha et al, 2009b), magnetic source imaging was visualized with both 2D and 3D rendering. The reconstructed neuromagnetic imaging was overlapped on MRI using three fiducial points.…”

Neuromagnetic high-frequency oscillations correlate with seizure severity in absence epilepsy

“…r represents the standard deviation of the Gaussian curve in the time domain. The mathematical algorithms, procedures, and parameters employed in this study have been described in detail in previous reports (Xiang et al, 2004(Xiang et al, , 2013Kotecha et al, 2009). Six hundred frequency bins and 600 time bands were applied to all MEG spectrograms.…”

Using ictal high-frequency oscillations (80–500Hz) to localize seizure onset zones in childhood absence epilepsy: A MEG study

“…Ictal MEG data were captured incidentally. The segments of MEG data with artifacts were set as "bad segments," which were automatically excluded from frequency analysis and source localization in our software package [3,14].…”

“…Magnetoencephalography (MEG), a relatively new clinical neuroimaging modality, is well suited for the study of epileptic discharges because MEG can noninvasively detect and localize neuromagnetic signals [2][3][4][5]. Brain activity in a low-frequency range (<80 Hz) has been conventionally studied in epilepsy.…”