A brain-computer interface based on bilateral transcranial Doppler ultrasound
September 1, 2011
In this study, we investigate the feasibility of a BCI based on transcranial Doppler ultrasound (TCD), a medical imaging technique used to monitor cerebral blood floow velocity. We classi ed the cerebral blood flow velocity changes associated with two mental tasks - a word generation task, and a mental rotation task. Cerebral blood flow velocity was measured simultaneously within the left and right middle cerebral arteries while nine able-bodied adults alternated between mental activity (i.e. word generation and mental rotation) and relaxation. Using linear discriminant analysis and a set of time domain features, word generation and mental rotation were classified with respective average accuracies of 82.9% plus/minus 10.5 and 85.7% plus/minus 10.0 across all participants. Accuracies for all participants significantly exceeded chance. These results indicate that TCD is a promising measurement modality for BCI research.
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