User Tutorial:Interpreting the Results

In User Tutorial:Performing an Offline Analysis of EEG Data, we used BCI2000 Offline Analysis to generate a feature plot, topographies and spectra for the eeg1 sample data comprising the data files eeg1_1.dat, eeg1_2.dat and eeg1_3.dat. In this continuation of the tutorial, we'll compare our results from User Tutorial:Performing an Offline Analysis of EEG Data to analyses of other data from the same subject.

Imagined vs. Real

BCI experiments will typically consist of sessions where the subject is asked to perform a movement followed by sessions where the user is asked to imagine making that movement. Comparing these data can help us to understand the relationship between doing and imagining. The images that follow show the results from the eeg1 data that were derived in User Tutorial:... followed by the results of an analysis performed on a different set of data recorded from the same subject. In the latter recordings, the subject was asked to imagine moving his feet or hands rather than actually performing these movements.

Results for actual movement:

Results for imagined movement:

Results for actual movement:

Results for imagined movement:

Results for actual movement:

Results for imagined movement:

As we can see, the images above are remarkably similar. This is often the case for data related in this manner.