Data Import and Export

• Direct readers for most EEG and MEG data file formats
• Import of user-defined file formats using generic reader
• Data import / export to ASCII and binary formats, e.g. MATLAB

Data Processing

• Superior digital filtering: high, low, and narrow band pass, notch
• Interpolation from recorded to virtual and source channels
• Automated EOG and EKG artifact detection and correction
• Advanced user defined instantaneous artifact correction
• Pattern detection and averaging by spatio-temporal correlation
• Linear and non-linear correlation between scalp and source channels
• Spectral analysis: FFT, DSA, power and phase mapping

Data Review

• Easy and fast review of digital EEG and MEG data files
• Fast paging, tagging and selected viewing of epochs of interest
• DSA and event displays for quick jump to relevant pages
• Additional selected and virtual artifact channels (EOG etc.)
• Pattern detection and averaging by spatio-temporal correlation
• Linear and non-linear correlation between scalp and source channels
• Spectral analysis: FFT, DSA, power and phase mapping

Handling of paradigms, events, and conditions

• Scripted paradigms for fast definition of triggers, conditions, epochs, filter settings etc.
• Import, export, and editing of event lists, triggers, and paradigms
• Design of complex conditions by logical expressions
• Creation of triggers from recorded signals, e.g. rectified EMG

Batch scripts for automated processing

• Fast and automated analysis of group studies using batch scripts
• Script functions for paradigm import
• Automated artifact scan with 2D graphical rejection tool
• Batch guided averaging within and across subjects
• User-defined combination of conditions (e.g. difference, average)
• Automated ERP peak detection and latency / apmlitude output
• Spatial and temporal data interpolation
• Batch commands for most source analysis functions

ERP Displays and tools

• Topographic display and 3D whole-head mapping of averaged waveforms
• User definable layout with postscript export
• Overplot of multiple conditions
• Display of additional channels (polygraphic,intracranial, source, EEG, MEG)
• Event related (de)synchronisation: Display of ERD/ERS waveforms

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

Time-frequency Analysis

• Time-frequency diagrams based on surface or source channels
• Display of absolute power or spectral amplitude
• Display of event-related spectral perturbation (ERD / ERS) in percent
• Temporal-spectral information optimized by complex demodulation
• Variable setting of time-frequency resolution
• Separation of evoked and induced activity by subtraction of the averaged evoked activity from single trials
• Direct comparison of two conditions
• 3D Imaging of oscillatory activity using the BESA Mulitple Source Beamformer (MSBF)

Source coherence

• Oscillatory coupling between brain regions analyzed directly in brain source space using source montages
• Calculation of cross-spectral matrices between any combination of source (and / or surface) channel
• Event-related coherence displayed in time-frequency space
• Coherence analysis based on power and phase locking
• Computation and display of phase delay and latency difference between channels

Statistical analysis

• Statistical probability maps based on resampling of the single trial data
• Statistics available for all time-frequency displays (absolute amplitude, TSE, coherence, comparison of conditions)
• Export of displayed data for offline statistics across subjects (e.g. in MATLAB)

System Requirements

• Pentium, 800 MHz or higher, 256 MB RAM (512 MB RAM with source coherence)
• Windows® 2000 or XP (Vista not supported yet)
• Graphics card supporting OpenGL 1.1 with 16 MB RAM or more

Certification

• BESA has CE Certification