Poster D93, Monday, March 26, 8:00-10:00 am, Exhibit Hall C
Assessment and Communication with Locked-in Patients Using A Vibro-tactile P300 and Motor Imagery Brain-Computer Interface
Christoph Guger1,2, Rossella Spataro3, Woosang Cho2, Rupert Ortner2, Fan Cao1, V. Labella3; 1Guger Technologies OG, Graz, Austria, 2g.tec medical engineering GmbH, Schiedlberg, Austria, 3University of Palermo, Palermo, Italy
There is an increasing need for patients with locked-in syndrome (LIS) or complete locked-in syndrome (CLIS) to use a non-visual dependent brain-computer interface (BCI) system. We developed such a system, to assess and communicate 9 LIS and 3 CLIS patients. There are three different modes, vibro-tactile stimulation with 2 vibro-stims (VT2), with 3 vibro-stims (VT3), and with motor imagery (MI) paradigms. In VT2 mode, the stimulators were fixed on the left and right wrist, and the patient was asked to count the stimuli on the target hand to elicit a P300 response. In VT3 mode, an additional stimulator was placed on the shoulder, and in MI mode, the patient was instructed to imagine either left or right hand movement. VT3 and MI modes were also used for simple yes or no questions. The patients achieved a mean accuracy of 76.6% in VT2, 63.1% in VT3, and 58.2% in MI after 2 training runs. 9 out of 12 LIS patients could communicate with VT2 and VT3 (on average 8 out of 10 questions answered correctly), and 3 out of 12 could communicate with MI paradigm (4 out of 5 questions answered correctly). 2 out of the 3 CLIS patients could communicate with VT3 (70% and 90% accuracy respectively). It is the first study showing BCI-based communication with CLIS patients and was able to bring 9 out of 12 patients to communicate with high accuracies using non-visual evoked potentials and motor imagery, more importantly it was achieved within 20 min.
Topic Area: PERCEPTION & ACTION: Motor control