12645
2015
eng
1039
8
article
1
2016-01-31
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An auditory multiclass brain-computer interface with natural stimuli: Usability evaluation with healthy participants and a motor impaired end user
Brain-computer interfaces (BCIs) can serve as muscle independent communication aids. Persons, who are unable to control their eye muscles (e.g., in the completely locked-in state) or have severe visual impairments for other reasons, need BCI systems that do not rely on the visual modality. For this reason, BCIs that employ auditory stimuli were suggested. In this study, a multiclass BCI spelling system was implemented that uses animal voices with directional cues to code rows and columns of a letter matrix. To reveal possible training effects with the system, 11 healthy participants performed spelling tasks on 2 consecutive days. In a second step, the system was tested by a participant with amyotrophic lateral sclerosis (ALS) in two sessions. In the first session, healthy participants spelled with an average accuracy of 76% (3.29 bits/min) that increased to 90% (4.23 bits/min) on the second day. Spelling accuracy by the participant with ALS was 20% in the first and 47% in the second session. The results indicate a strong training effect for both the healthy participants and the participant with ALS. While healthy participants reached high accuracies in the first session and second session, accuracies for the participant with ALS were not sufficient for satisfactory communication in both sessions. More training sessions might be needed to improve spelling accuracies. The study demonstrated the feasibility of the auditory BCI with healthy users and stresses the importance of training with auditory multiclass BCIs, especially for potential end-users of BCI with disease.
Frontiers in Human Neuroscience
10.3389/fnhum.2014.01039
urn:nbn:de:bvb:20-opus-126450
Frontiers in Human Neuroscience 8:1039. doi:10.3389/fnhum.2014.01039
288566
Nadine Simon
Ivo Käthner
Carolin A. Ruf
Emanuele Pasqualotto
Andrea Kübler
Sebastian Halder
eng
uncontrolled
P300
eng
uncontrolled
EEG
eng
uncontrolled
auditory BCI
eng
uncontrolled
brain-computer interface
eng
uncontrolled
communication
eng
uncontrolled
ALS
Psychologie
open_access
Institut für Psychologie
OpenAIRE
Förderzeitraum 2015
Universität Würzburg
https://opus.bibliothek.uni-wuerzburg.de/files/12645/Kaethner_fnhum-08-01039.pdf
9726
2013
eng
article
1
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Prediction of P300 BCI Aptitude in Severe Motor Impairment
Brain-computer interfaces (BCIs) provide a non-muscular communication channel for persons with severe motor impairments. Previous studies have shown that the aptitude with which a BCI can be controlled varies from person to person. A reliable predictor of performance could facilitate selection of a suitable BCI paradigm. Eleven severely motor impaired participants performed three sessions of a P300 BCI web browsing task. Before each session auditory oddball data were collected to predict the BCI aptitude of the participants exhibited in the current session. We found a strong relationship of early positive and negative potentials around 200 ms (elicited with the auditory oddball task) with performance. The amplitude of the P2 (r = −0.77) and of the N2 (r = −0.86) had the strongest correlations. Aptitude prediction using an auditory oddball was successful. The finding that the N2 amplitude is a stronger predictor of performance than P3 amplitude was reproduced after initially showing this effect with a healthy sample of BCI users. This will reduce strain on the end-users by minimizing the time needed to find suitable paradigms and inspire new approaches to improve performance.
PLoS ONE
10.1371/journal.pone.0076148
urn:nbn:de:bvb:20-opus-97268
In: PLoS ONE (2013) 8: 10, doi:10.1371/journal.pone.0076148
224631
288566
Sebastian Halder
Carolin Anne Ruf
Adrian Furdea
Emanuele Pasqualotto
Daniele De Massari
Linda van der Heiden
Martin Bogdan
Wolfgang Rosenstiel
Niels Birbaumer
Andrea Kübler
Tamara Matuz
eng
uncontrolled
amyothropic lateral sclerosis
eng
uncontrolled
electrode potentials
eng
uncontrolled
electroencephalography
eng
uncontrolled
event-related potentials
eng
uncontrolled
functional magnetic imaging
eng
uncontrolled
human performance
eng
uncontrolled
man-computer interface
eng
uncontrolled
topography
Medizin und Gesundheit
open_access
Institut für Psychologie
OpenAIRE
Förderzeitraum 2013
Universität Würzburg
https://opus.bibliothek.uni-wuerzburg.de/files/9726/Halder_journal.pone.0076148.pdf