User Tutorial:Configuring Online Feedback: Difference between revisions
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They are entered into the ''Classifier'' parameter on the ''Filtering'' tab; there, click the ''Edit Matrix'' button associated with the ''Classifier'' parameter. | They are entered into the ''Classifier'' parameter on the ''Filtering'' tab; there, click the ''Edit Matrix'' button associated with the ''Classifier'' parameter. | ||
*Set ''Number of columns'' to 4, and ''Number of rows'' to 1 (or the number of features that you wish to use); then, click ''Set new matrix size'' to apply your changes. | *Set ''Number of columns'' to 4, and ''Number of rows'' to 1 (or the number of features that you wish to use); then, click ''Set new matrix size'' to apply your changes. | ||
*In the first column (of the first row), labeled ''input channel'', enter the location of the desired location, e.g. <tt>CP3</tt>. If you did not specify electrode locations when configuring | *In the first column (of the first row), labeled ''input channel'', enter the location of the desired location, e.g. <tt>CP3</tt>. If you did not specify electrode locations when configuring your system, enter the channel number associated with the feedback electrode. | ||
*In the second column, labeled ''input element (bin)'', enter feedback frequency in Hz, immediately followed with ''Hz'', as in <tt>12Hz</tt>. | *In the second column, labeled ''input element (bin)'', enter feedback frequency in Hz, immediately followed with ''Hz'', as in <tt>12Hz</tt>. | ||
*In the third column, enter the value 2 corresponding to the control channel for vertical control of the cursor. | *In the third column, enter the value 2 corresponding to the control channel for vertical control of the cursor. | ||
Revision as of 09:35, 23 October 2008
This tutorial step assumes that you have performed and analyzed an initial session. Now you are going to create a subject-specific parameter configuration for on-line feedback.
Starting up BCI2000
Start BCI2000 using the appropriate batch file at batch/CursorTask_<YourAmplifier>.bat. You might consider creating a link to this file on the desktop.
Subject-Specific Parameters
Now, we will construct a full parameter file that is specific to that subject:
- In the configuration window, click Load Parameters to load parms/mu_tutorial/MuFeedback.prm.
- Additionally, load the system configuration file from parms/fragments/<YourSystem>.prm, or whereever you saved the system parameter file that you created for the initial session.
- Go to the Storage tab, and enter the subject's name or ID into the SubjectName parameter.
- Into the SubjectSession parameter, enter 002.
Configuring the Classifier
Subject-specific electrode location and mu rhythm frequency are part of the classifier's configuration. They are entered into the Classifier parameter on the Filtering tab; there, click the Edit Matrix button associated with the Classifier parameter.
- Set Number of columns to 4, and Number of rows to 1 (or the number of features that you wish to use); then, click Set new matrix size to apply your changes.
- In the first column (of the first row), labeled input channel, enter the location of the desired location, e.g. CP3. If you did not specify electrode locations when configuring your system, enter the channel number associated with the feedback electrode.
- In the second column, labeled input element (bin), enter feedback frequency in Hz, immediately followed with Hz, as in 12Hz.
- In the third column, enter the value 2 corresponding to the control channel for vertical control of the cursor.
- In the fourth column, enter 1 as the weight.
- Repeat steps 2-5 for each additional feature moving down a row each time (i.e., enter the 2nd feature on the 2nd row, etc...).
- Finally, save your configuration to parms/subjects/mu_feedback/<Subject>002.prm, or whereever you find appropriate.
Next Step
In the next step, you will learn how to actually perform a Mu rhythm feedback session using the configuration created in the present step.
See also
User Tutorial:Mu Rhythm BCI Tutorial, User Reference:SpatialFilter, User Reference:LinearClassifier