Listen, you are writing! Speeding up online spelling with a dynamic auditory BCI

被引:101
作者
Schreuder, Martijn [1 ]
Rost, Thomas [1 ,2 ]
Tangermann, Michael [1 ]
机构
[1] Berlin Inst Technol, Machine Learning Lab, D-10587 Berlin, Germany
[2] Bernstein Ctr Computat Neurosci, Berlin, Germany
关键词
brain-computer interface; directional hearing; auditory event-related potentials; P300; N200; dynamic subtrials;
D O I
10.3389/fnins.2011.00112
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
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.
引用
收藏
页码:1 / 12
页数:12
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