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PAPER |
1 Institute of Medical Psychology and Behavioural Neurobiology, University of Tuebingen, Tuebingen, Germany
2 Centre for Cognitive Neuroscience, University of Trento, Trento, Italy
Correspondence to:
Correspondence to:
Dr N Neumann, Institute of Medical Psychology and Behavioural Neurobiology, University of Tuebingen, Gartenstrasse 29, 72074 Tuebingen, Germany;
nicola.neumann{at}uni-tuebingen.de
Methods: Five severely paralysed patients diagnosed with amyotrophic lateral sclerosis were trained to produce SCP amplitudes of negative and positive polarity by means of visual feedback and operant conditioning strategies. Performance was measured as percentage of correct SCP amplitude shifts. To determine the relation between initial and later performance in SCP self regulation, Spearmans rank correlations were calculated between maximum and mean performance at the beginning of training (runs 130) and mean performance at two later time points (runs 6493 and 162191).
Results: Spearmans rank correlations revealed a significant relation between maximum and mean performance in runs 130 and mean performance in runs 6493 (r= 0.9 and 1.0) and maximum and mean performance in runs 130 and mean performance in runs 162191 (r=1.0 and 1.0).
Conclusions: Initial performance in the self regulation of SCP is positively correlated with later performance in severely paralysed patients, and thus represents a useful predictor for efficient brain-computer communication.
Keywords: brain-computer communication; amyotrophic lateral sclerosis; locked in syndrome; skill; slow cortical potentials
Abbreviations: SCP, slow cortical potential; BCI, brain-computer interface; ALS, amyotrophic lateral sclerosis; CRR, correct response rate
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