Imaging somatosensory cortex responses measured by OPM-MEG: Variational free energy-based spatial smoothing estimation approach.In recent years, optically pumped magnetometer (OPM)-based magnetoencephalography (MEG) has shown potential for analyzing brain activity.  We constructed a 32-channel OPM-MEG system and used it to measure cortical responses to median and ulnar nerve stimulations.  A series of computer simulations based on the OPM-MEG showed better performance than the three types of competing methods under different levels of signal-to-noise ratios, source patch sizes, and co-registration errors.  FESSE was then applied to the source imaging of the OPM-MEG experimental data.
OPM
Imaging somatosensory cortex responses measured by OPM-MEG: Variational free energy-based spatial smoothing estimation approach.In recent years, optically pumped magnetometer (OPM)-based magnetoencephalography (MEG) has shown potential for analyzing brain activity.  It has a flexible sensor configuration and comparable sensitivity to conventional SQUID-MEG.  We constructed a 32-channel OPM-MEG system and used it to measure cortical responses to median and ulnar nerve stimulations.  A series of computer simulations based on the OPM-MEG showed better performance than the three types of competing methods under different levels of signal-to-noise ratios, source patch sizes, and co-registration errors.  FESSE was then applied to the source imaging of the OPM-MEG experimental data.
MEG
It has a flexible sensor configuration and comparable sensitivity to conventional SQUID-MEG. 
SQUID-MEG
We proposed a new method called variational free energy-based spatial smoothing estimation (FESSE) to enhance the accuracy of mapping somatosensory cortex responses.  FESSE was then applied to the source imaging of the OPM-MEG experimental data.
FESSE