Real-time processing of EEG/MEG data with Matlab

Real-time processing of EEG/MEG data with Matlab

We are working on the real-time support for data analysis (feature extraction and classification) in FieldTrip. Besides feature extraction and classification, which are both needed for BCI and neurofeedback applications, we have implemented support for real-time processing of EEG/MEG data in MATLAB in general.

The FieldTrip buffer provides a real-time interface between MATLAB and streaming EEG/MEG data

Integration with other software and with acquisition systems

Bart
BrainTV
OpenVibe

Transmitting data from an acquisition system to a FieldTrip buffer

Acquisition system or protocol	Matlab-based	stand-alone (C/C++)	other solutions
ANT NeuroSDK	ft_realtime_asaproxy		NeuroSDK toolkit
BrainVision Remote Data Access (RDA)	ft_realtime_brainampproxy	rda2ft (coming soon)	BCI2000, using FieldTripBuffer filter
CTF/VSM MedTech	AcqBuffer + ft_realtime_ctfproxy	acq2ft
Micromed	ft_realtime_micromedproxy
Neuralynx	ft_realtime_neuralynxproxy	nlx2ft
Neuromag		under development
Siemens MR scanners		PixelDataGrabber
Testing: sine waves	ft_realtime_signalproxy	sine2ft, demo_sinewave
Testing: fMRI data	ft_realtime_fmriproxy	nii_to_buffer

Reading data from the FieldTrip buffer into analysis platforms

Analysis platform	Interface type
BCI2000	RDA streaming interface (demo_buffer_rda)
BrainStream	directly supported through Matlab binding

Language bindings for integration with custom applications

Language	Client	Server	Notes
C	yes	yes	Reference implementation
C++	yes	yes (C)	Thin wrapper classes for handling client requests
Matlab	yes	yes	Full support via MEX files
Python (Numpy)	yes	no	Incomplete so far, work in progress

Closing the loop

For a real-time BCI system, it is important that a control signal somehow can be used to close the loop towards the subject. Here you can find a description on the options that you have for closing the loop from within your Matlab-based BCI application.

Additional documentation on real-time analysis

Tutorials

Realtime analysis - Offline and online processing of simulated and real data

2009/05/05 14:01

Robert Oostenveld

Example scripts

Example real-time average	2010/05/17 15:22
Example real-time average	2009/04/21 12:23
Example real-time classification	2010/05/17 15:22
Example real-time classification	2009/04/21 12:23
Example real-time power estimate	2010/05/17 15:22
Example real-time power estimate	2009/04/21 12:23
Example real-time selective average	2010/05/17 15:22
Example real-time selective average	2009/04/21 12:23
Example real-time signal viewer	2010/05/17 15:23
Example real-time signal viewer	2009/04/21 12:05
Getting started with real-time analysis for BCI/neurofeedback	2009/04/20 23:01	Robert Oostenveld
Measuring the timing delay and jitter for a real-time application	2009/12/02 15:34
Realtime neurofeedback application based on Hilbert phase estimation	2010/05/17 15:22

Frequently asked questions

How fast is the FieldTrip buffer for realtime data streaming?	2009/06/17 16:48	Robert Oostenveld
What kind of cable do I need for a serial port connection between two computers	2010/02/04 09:22

development/realtime.txt · Last modified: 2010/07/02 14:54 by stefan.klanke

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