The Hybrid BCI
published: Aug. 10, 2009, recorded: July 2009, views: 6803
Report a problem or upload filesIf you have found a problem with this lecture or would like to send us extra material, articles, exercises, etc., please use our ticket system to describe your request and upload the data.
Enter your e-mail into the 'Cc' field, and we will keep you updated with your request's status.
There are several different BCI approaches, which may or may not depend on external stimulation. Slow cortical potential (SCP)-, event-related desynchronisation (ERD)- and sensorimotor rhythm (SMR)-BCIs do not require external stimulation, while P300-BCIs and steady state visual evoked potential (SSVEP)-BCIs do. Dependent means in this respect that the user has to focus attention and/or gaze to flickering/flashing lights or and can therefore not completely freely decide to perform an action. Each type of BCI system has advantages and disadvantages. SSVEP-BCIs need minimal training time and can achieve a high information transfer rate (ITR), but have a relatively high false positive rate during rest. In contrast, an asynchronous brain switch based on the post-imagery beta ERS has a low ITR, but can be set up quickly and easily with a low false position rate (Pfurtscheller and Solis-Escalante, Clin. Neurophysio. 2009). It is therefore a challenge to use the advantages of different BCI systems and create a “hybrid” BCI system by switching e.g. a battery of flickering lights (SSVEP-BCI) on or off by using a brain switch (ERD-BCI). Another type of “hybrid” BCI can analyse motor imagery related EEG changes and SSVEP amplitudes simultaneously. It was shown recently that such a “hybrid” strategy results in a better classification accuracy relative to either an ERD or SSVEP classification alone (Allison et al submitted 2009).
Link this pageWould you like to put a link to this lecture on your homepage?
Go ahead! Copy the HTML snippet !