PASCAL - Pattern Analysis, Statistical Modelling and Computational Learning

Listen, you are writing! : Speeding up online spelling with a dynamic auditory BCI
Martijn Schreuder, T. Rost and Michael Tangermann
Frontiers in Neuroscience Volume 5, Number 112, 2011.


Representing an intuitive spelling interface for brain–computer interfaces (BCI) in the auditory domain is not straight-forward. In consequence, all existing approaches based on event-related potentials (ERP) 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 ERP). 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 (7.55 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.

EPrint Type:Article
Additional Information:This work is supported by the European ICT Programme Project TOBI FP7-224631.
Project Keyword:Project Keyword UNSPECIFIED
Subjects:Brain Computer Interfaces
ID Code:9376
Deposited By:Martijn Schreuder
Deposited On:16 March 2012