Long-Term Stable Control of Motor-Imagery BCI by a Locked-In User Through Adaptive Assistance

Performance variation is one of the main challenges that BCIs are confronted with, when being used over extended periods of time. Shared control techniques could partially cope with such a problem. In this paper, we propose a taxonomy of shared control approaches used for BCIs and we review some of the recent studies at the light of these approaches. We posit that the level of assistance provided to the BCI user should be adjusted in real time in order to enhance BCI reliability over time. This approach has not been extensively studied in the recent literature on BCIs. In addition, we investigate the effectiveness of providing online adaptive assistance in a motor-imagery BCI for a tetraplegic end-user with an incomplete locked-in syndrome in a longitudinal study lasting 11 months. First, we report a reliable estimation of the BCI performance (in terms of command delivery time) using only a window of 1 s in the beginning of trials (AUC $approx 0.8$ ). Second, we demonstrate how adaptive shared control can exploit the output of the performance estimator to adjust online the level of assistance in a BCI game by regulating its speed. In particular, online adaptive assistance was superior to a fixed condition in terms of success rate ( ${p}
Source: IEE Transactions on Neural Systems and Rehabilitation Engineering - Category: Neuroscience Source Type: research

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We report a young woman with a life-threatening basilar artery thrombosis during sexual intercourse, with a resulting locked-in syndrome. The positive high intensity transient signals (HITS) diagnosis showed a right-to-left shunt and is in line with paradoxic embolism. The molecular genetics revealed a homozygosity 4G/4G in the region PAI1, -675 (promoter polymorphism) as a risk factor for ischemic stroke. Sexual intercourse is a possible, albeit unusual stroke cause, especially in young people.
Source: Journal of Clinical Neuroscience - Category: Neuroscience Source Type: research
This study demonstrates that body part-specific somatosensory imagery differentially activates somatosensory cortex in a topographically specific manner; evidence which was surprisingly still lacking in the literature. It also offers proof of concept for a novel somatosensory imagery-based fMRI-BCI control strategy, with particularly high potential for visually and motor-impaired patients. The strategy could also be transferred to lower MRI field strengths and to mobile functional near-infrared spectroscopy. Finally, given that communication BCIs provide the BCI user with a form of feedback based on their brain signals and...
Source: Frontiers in Human Neuroscience - Category: Neuroscience Source Type: research
The unidentified patient, from Maryland, suffered a rare but devastating brain-stem stroke which paralysed her from head-to-toe. She was diagnosed with locked-in syndrome.
Source: the Mail online | Health - Category: Consumer Health News Source Type: news
ConclusionOur patient developed locked-in syndrome after use of cocaine. Given the prevalence of its use in the United States, cocaine use should be included among the potential causes of locked-in syndrome.
Source: Journal of Medical Case Reports - Category: General Medicine Source Type: research
Publication date: Available online 16 November 2019Source: Brain StimulationAuthor(s): Takeshi Satow, Taro Komuro, Takuya Yamaguchi, Nobuhiko Tanabe, Tatsuya Mima
Source: Brain Stimulation - Category: Neurology Source Type: research
New Zealand pharmacist Anstey Campbell decided to start the morning of January 17 with a light jog before heading off to work, noticing that the prickling sensation hadn't subsided by lunchtime.
Source: the Mail online | Health - Category: Consumer Health News Source Type: news
Publication date: Available online 2 November 2019Source: Annals of Physical and Rehabilitation MedicineAuthor(s): Yifan Yan, Athena Demertzi, Yinyan Xia, Jing Wang, Nantu Hu, Zhiliang Zhang, Haibo Di, Steven LaureysAbstractBackgroundLocked-in syndrome (LIS) characterizes individuals who have experienced pontine lesions, who have limited motor output but with preserved cognitive abilities. Despite their severe physical impairment, individuals with LIS self-profess a higher quality of life than generally expected. Such third-person expectations about LIS are shaped by personal and cultural factors in western countries.Objec...
Source: Annals of Physical and Rehabilitation Medicine - Category: Rehabilitation Source Type: research
Conclusion: Bilateral cerebral peduncle infarction may be related to cerebral perfusion insufficiency caused by the stenosis or occlusion of vertebrobasilar artery and its branches. The main clinical manifestations are locked-in syndrome and persistent vegetative state. The specific imaging feature of “Mickey Mouse ear”-like infarction is associated with a poor prognosis.
Source: Frontiers in Neurology - Category: Neurology Source Type: research
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Source: Nutritional Neuroscience - Category: Nutrition Authors: Source Type: research
Peter Coghlan, of Manchester, was diagnosed with locked-in syndrome in 2011. At his lowest point, he didn't want to live, but he turned his recovery around.
Source: the Mail online | Health - Category: Consumer Health News Source Type: news
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