期刊
FRONTIERS IN NEUROSCIENCE
卷 5, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fnins.2011.00112
关键词
brain-computer interface; directional hearing; auditory event-related potentials; P300; N200; dynamic subtrials
资金
- European Information and Communication Technologies (ICT) Programme Project [FP7-224631, 216886]
- Deutsche Forschungsgemeinschaft (DFG) [MU 987/3-2]
- Bundesministerium fur Bildung und Forschung (BMBF) [FKZ 01IB001A, 01GQ0850]
- FP7-ICT Programme of the European Community, under the PASCAL2 Network of Excellence [ICT-216886]
Representing an intuitive spelling interface for brain computer interfaces (BCD in the auditory domain is not straight-forward. In consequence, all existing approaches based on event-related potentials (ERR) rely at least partially on a visual representation of the interface. This online study introduces an auditory spelling interface that eliminates the necessity for such a visualization. In up to two sessions, a group of healthy subjects (N = 21) was asked to use a text entry application, utilizing the spatial cues of the AMUSE paradigm (Auditory Multi-class Spatial ERR). The speller relies on the auditory sense both for stimulation and the core feedback. Without prior BCI experience, 76% of the participants were able to write a full sentence during the first session. By exploiting the advantages of a newly introduced dynamic stopping method, a maximum writing speed of 1.41 char/min (755 bits/min) could be reached during the second session (average: 0.94 char/min, 5.26 bits/min). For the first time, the presented work shows that an auditory BCI can reach performances similar to state-of-the-art visual BCIs based on covert attention. These results represent an important step toward a purely auditory BCI.
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