Source analysis

SOURCE ANALYSIS AND IMAGING

BESA has a highly interactive and easy-to-use window for source analysis. All relevant information is available at one glance including data, PCA, source waveforms and source localization in 3D head schemes or standardized MRI. You can choose among a variety of state-of-the-art source modeling techniques and head models. 2D and 3D source imaging can be performed with projection onto a standardized MRI.

Source Localization

• Highly interactive graphical user interface for fast hypothesis testing
• Spatio-temporal multiple dipole and regional source modeling
• Image-weighted source fitting
• Tomographic source sensitivity display
• Automated multiple source probe scan (MSPS) for model validation
• (MSPS) for model validation
• Automated source fitting: RAP-MUSIC, Genetic algorithm
• PCA analysis with generation of spatial source components
• Realistic standardized FEM and multi-shell ellipsoidal head models

Source imaging

• 3D imaging of oscillatory activity using the multiple source beamformer (MSBF)
• Distributed volume images: LORETA, sLORETA, swLORETA, LAURA, SSLOFO
• Iterative and user-defined 3D imaging
• Minimum norm images based on the individual brain surface
• 3D movie of maps and dipoles using source waveforms
• Source activity projected onto standardized or individual MRI

Source import and export

• Direct transfer of source models between subjects and conditions
• Export of source models and source waveforms in ASCII
• Creation of source montages
• Coordinate systems: Talairach / Head / Device / Unit Sphere
• Batch commands for many source analysis functions

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SOURCE MONTAGES AND 3D WHOLE-HEAD MAPPING

New montage editor

• Graphical editing of user montages for convenient data review
• Virtual montages with standardized electrode locations
• Combined montages of recorded, virtual, and source channels
• Immediate resorting for regional and hemispheric comparison

Source montages

• Transformation of surface EEG or MEG into brain source activity
• Montages derived from multiple dipole or regional source models
• Standardization for various brain regions or definition by the user
• Additional channels to display PCA components and / or eye artifacts

3D whole-head mapping

• Whole-head spline interpolation for voltage and CSD mapping
• 3D or 2D view of maps, sensors, and head surface points
• Mapping of FFT power, amplitude, and phase
• MEG maps of flux and planar gradients at the scalp surface
• Time series of maps with easy selection of viewpoint, number of maps, and epoch of interest 

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