Getting started with BrainVision Analyzer and Easycap
Brain Products provides technical and software solutions for neurophysiological and psychophysiological research and clinical applications. Their BrainAmp ExG amplifier allows to record signals with a sampling rate up to 5000 Hz and a broad hardware bandwidth ranging from DC to 1000 Hz. Brain Products also provides EEG caps, i.e. 'Easycaps', which contain the electrodes distributed over the head. These Easycaps are actually fabricated by http://www.easycap.de, where you can also find more information. Although it is possible to use a BrainAmp amplifier with another type of cap, or to use an Easycap with an different amplifier, the most common case is to use them together and that is why we describe them jointly on this page.
FieldTrip needs the user to define what file to read in. The BrainVision Recorder software usually stores different filetypes (.vhdr, .eeg, .vmrk). For reading the data into FieldTrip you can refer to the .eeg file, for example:
cfg = ; cfg.dataset = '/users/karlheinz/EEG/myrecording.eeg'; ...
FieldTrip provides digital layouts for the purpose of plotting data recorded by means of an easycap. These layouts are stored in *.mat files and are based on the manufacturer's original drawings, which can also be found as *.gif files in the /template/layout directory.
Using FieldTrip, data recorded with Brain Vision hard- and software is readily plotted. It is important that the channel labels match that of the manufacturer specifications. Specify the layout that matches your set-up/easycap when plotting, e.g.
cfg.layout = 'easycapM1.lay';