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→BrainVision Recorder - Default Workspace
== BrainVision Recorder - Default Workspace ==
== BrainVision Recorder - Default Workspace ==
Audience:
'''Audience:'''
All BrainVision Recorder users
All BrainVision Recorder users
Description
'''Description'''
To make sure all data acquired at the DCCN can be utilized for extensive analysis, default settings (sample rate, filters and such) are recommended for all EEG experiments.
To make sure all data acquired at the DCCN can be utilized for extensive analysis, default settings (sample rate, filters and such) are recommended for all EEG experiments.
These settings have to be specified in the Workspace of the BrainVision Recorder package (screenshots of the BrainVision Recorder program are used below to illustrate how one can enter the settings correctly into the workspace).
These settings have to be specified in the Workspace of the BrainVision Recorder package (screenshots of the BrainVision Recorder program are used below to illustrate how one can enter the settings correctly into the workspace).
Defining a workspace in BrainVision Recorder
'''Defining a workspace in BrainVision Recorder'''
The default settings required for EEG experiments have to be specified in the Workspace of the BrainVision Recorder package. This can be done as follows.
The default settings required for EEG experiments have to be specified in the Workspace of the BrainVision Recorder package. This can be done as follows.
Make a copy with a new name of an existing workspace file.
Make a copy with a new name of an existing workspace file.
Open the BrainVision Recorder package on the EEG computer in the lab of your choice by double clicking on the icon.
*Open the BrainVision Recorder package on the EEG computer in the lab of your choice by double clicking on the icon.
Go to File / Open Workspace and open your workspace file.
*Go to File / Open Workspace and open your workspace file.
Go to File / Edit Workspace.
*Go to File / Edit Workspace.
The following window will appear on the computer screen:
*The following window will appear on the computer screen:
[[File:1.gif]]
[[File:1.gif]]
Always keep a copy of the workspace file with your raw data! Never leave your data on the EEG-PC. Always copy data immediately after your experiment to your network drive.
Always keep a copy of the workspace file with your raw data! Never leave your data on the EEG-PC. Always copy data immediately after your experiment to your network drive.
Every two weeks your data will be erased automatically.
Every two weeks your data will be erased automatically.
AMPLIFIER SETTINGS:
'''Good practice directly after your experiment:
*Ensure you have a copy of your workspace file
*Copy your data to your home directory on central storage
*Make an archive-copy of your raw data files according to the archiving policy in your PI-group.
*Delete your data files from the local disk of the EEG-PC. Files will be erased automatically after two weeks!
'''
'''AMPLIFIER SETTINGS:'''
Click on the button "next", the following window appears on your screen:
Click on the button "next", the following window appears on your screen:
First press "Scan for Amplifiers". BrainVision Recorder will give an overview of the amplifiers the software is communicating with.
First press "Scan for Amplifiers". BrainVision Recorder will give an overview of the amplifiers the software is communicating with.
The following default DCCN settings are recommended for all channels.
The following default DCCN settings are recommended for all channels.
Setting
'''Setting
Default DCCN
Default'''
Nr. of channels to be used
Nr. of channels to be used
SOFTWARE FILTERS:
'''SOFTWARE FILTERS:'''
Click on the button Next, the following window appears on your screen.
Click on the button Next, the following window appears on your screen.
PLEASE NOTE THAT THIS CARD HAS THREE TABS!
'''PLEASE NOTE THAT THIS CARD HAS THREE TABS!'''
TAB1: "Raw data saving filters"
'''TAB1: "Raw data saving filters"'''
The following default settings are recommended for all channels:
The following default settings are recommended for all channels:
Setting
Setting
Switched OFF
Switched OFF
Note 1:
'''Note 1:'''
Sampling of the EEG is done by the amplifier with 5000Hz fixed and either 1000Hz anti aliasing filter (normal) or 250Hz anti aliasing filter (MRI only!). Downsampling can be done realtime on the computer to 200, 250, 500, 1000, 2500 or 5000. An appropriate anti-aliasing filter should be selected for that as well, depending on the downsampling frequency.
Sampling of the EEG is done by the amplifier with 5000Hz fixed and either 1000Hz anti aliasing filter (normal) or 250Hz anti aliasing filter (MRI only!). Downsampling can be done realtime on the computer to 200, 250, 500, 1000, 2500 or 5000. An appropriate anti-aliasing filter should be selected for that as well, depending on the downsampling frequency.
At the default sampling rate of 500Hz, use a cutoff frequency of 200Hz.
At the default sampling rate of 500Hz, use a cutoff frequency of 200Hz.
Note 2:
'''Note 2:'''
Skin impedance should be kept low, e.g. below 3kΩ. We are currently looking into the possibility of running experiments with high skin impedance.
Skin impedance should be kept low, e.g. below 3kΩ. We are currently looking into the possibility of running experiments with high skin impedance.
TAB2: "Segmentation filters"
'''TAB2: "Segmentation filters"'''
Click on the tab "Segmentation Filters", the following window appears on your screen.
Click on the tab "Segmentation Filters", the following window appears on your screen.
On this page filters can be specified for all data that is segmented/averaged online.
On this page filters can be specified for all data that is segmented/averaged online.
Since we recommend to collect all data in the continuous mode, these filters do not have to be specified and the "Enable Filters" option should be switched off.
'''Since we recommend to collect all data in the continuous mode, these filters do not have to be specified and the "Enable Filters" option should be switched off.'''
'''TAB 3: "Display filters"'''
Click on the tab "Display Filters", the following window appears on your screen.
Click on the tab "Display Filters", the following window appears on your screen.
It is recommended to set the filters in exactly the same way as the "Raw Data Saving Filters" so that you see is what you get.
It is recommended to set the filters in exactly the same way as the "Raw Data Saving Filters" so that you see is what you get.
Thus, the following default settings are recommended:
Thus, the following default settings are recommended:
Setting
'''Setting
Default DCCN
Default DCCN'''
Enable filters
Enable filters
Switched ON
Switched ON
Switched OFF
Switched OFF
SEGMENTATION / AVERAGING:
'''SEGMENTATION / AVERAGING:'''
Click on the button "next", the following window appears on your screen:
Click on the button "next", the following window appears on your screen:
On this page settings can be specified for online segmentation/averaging of EEG data. Since we recommend to collect all data in the continuous mode, these settings do not have to be specified and the "Enable Filters" option should be switched off.
On this page settings can be specified for online segmentation/averaging of EEG data. '''Since we recommend to collect all data in the continuous mode, these settings do not have to be specified and the "Enable Filters" option should be switched off.'''
However, if one would like to see an average of their data on screen, just for display purposes, one can enter the settings here (and the filter specifications for the segmented data in the "Segmentation Filters" tab (described above)).
However, if one would like to see an average of their data on screen, just for display purposes, one can enter the settings here (and the filter specifications for the segmented data in the "Segmentation Filters" tab (described above)).
Links and Documentation
Links and Documentation
For the standard 32 and 64 electrode setup, workspaces are available here.
For the standard 32 and 64 electrode setup, workspaces are available here.
Please check the BrainVision Recorder manual (English / German) for more in depth details.
Please check the BrainVision Recorder manual (English / German) for more in depth details.