Title |
A Novel 9-Class Auditory ERP Paradigm Driving a Predictive Text Entry System
|
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Published in |
Frontiers in Neuroscience, January 2011
|
DOI | 10.3389/fnins.2011.00099 |
Pubmed ID | |
Authors |
Johannes Höhne, Martijn Schreuder, Benjamin Blankertz, Michael Tangermann |
Abstract |
Brain-computer interfaces (BCIs) based on event related potentials (ERPs) strive for offering communication pathways which are independent of muscle activity. While most visual ERP-based BCI paradigms require good control of the user's gaze direction, auditory BCI paradigms overcome this restriction. The present work proposes a novel approach using auditory evoked potentials for the example of a multiclass text spelling application. To control the ERP speller, BCI users focus their attention to two-dimensional auditory stimuli that vary in both, pitch (high/medium/low) and direction (left/middle/right) and that are presented via headphones. The resulting nine different control signals are exploited to drive a predictive text entry system. It enables the user to spell a letter by a single nine-class decision plus two additional decisions to confirm a spelled word. This paradigm - called PASS2D - was investigated in an online study with 12 healthy participants. Users spelled with more than 0.8 characters per minute on average (3.4 bits/min) which makes PASS2D a competitive method. It could enrich the toolbox of existing ERP paradigms for BCI end users like people with amyotrophic lateral sclerosis disease in a late stage. |
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Professor > Associate Professor | 7 | 6% |
Other | 19 | 15% |
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Other | 15 | 12% |
Unknown | 22 | 17% |