While often presented as promising assistive technologies for motor-impaired users, electroencephalography (EEG)-based Brain-Computer Interfaces (BCIs) remain barely used outside laboratories due to low reliability in real-life conditions. There is thus a need to design long-term reliable BCIs that can be used outside-of-the-lab by end-users, e.g., severely motor-impaired ones. Therefore, we propose and evaluate the design of a multi-class Mental Task (MT)-based BCI for longitudinal training (20 sessions over 3 months) of a tetraplegic user for the CYBATHLON BCI series 2019. In (...) this BCI championship, tetraplegic pilots are mentally driving a virtual car in a racing video game. We aimed at combining a progressive user MT-BCI training with a newly designed machine learning pipeline based on adaptive Riemannian classifiers shown to be promising for real-life applications. We followed a two step training process: the first 11 sessions served to train the user to control a 2-class MT-BCI by performing either two cognitive tasks (REST and MENTAL SUBTRACTION) or two motor-imagery tasks (LEFT-HAND and RIGHT-HAND). The second training step (9 remaining sessions) applied an adaptive, session-independent Riemannian classifier that combined all 4 MT classes used before. Moreover, as our Riemannian classifier was incrementally updated in an unsupervised way it would capture both within and between-session non-stationarity. Experimental evidences confirm the effectiveness of this approach. Namely, the classification accuracy improved by about 30% at the end of the training compared to initial sessions. We also studied the neural correlates of this performance improvement. Using a newly proposed BCI user learning metric, we could show our user learned to improve his BCI control by producing EEG signals matching increasingly more the BCI classifier training data distribution, rather than by improving his EEG class discrimination. However, the resulting improvement was effective only on synchronous (cue-based) BCI and it did not translate into improved CYBATHLON BCI game performances. For the sake of overcoming this in the future, we unveil possible reasons for these limited gaming performances and identify a number of promising future research directions. Importantly, we also report on the evolution of the user's neurophysiological patterns and user experience throughout the BCI training and competition. (shrink)

1. Prof. PhDr. František Daneš, DrSc. ; Prof. PhDr. Eva Hajičová, DrSc. ; PhDr. Pavel Jančák, CSc. ; Prof PhDr. Miroslav Komárek, DrSc. ; Doc. PhDr. Iva Nebeská, CSc. ; Prof. PhDr. Bohumil Palek, DrSc. ; PhDr Jaromír Povejšil, CSc. ; PhDr. Marie Těšitelová, DrSc. ; Prof. PhDr. Oldřich Uličný, DrSc. ; Prof. PhDr. Radoslav Večerka, DrSc. -- 2. Jan Balhar, Zoe Hauptová, Milan Jelínek, Jan Kořenský, Jiří Kraus, Jaroslav Kuchař, Zdena Palková, Petr Sgall, Dušan Šlosar, Ludmila Uhlířová.

It is a consensus that familiarity and recollection contribute to episodic recognition memory. However, it remains controversial whether familiarity and recollection are qualitatively distinct processes supported by different brain regions, or whether they reflect different strengths of the same process and share the same support. In this review, I discuss how adapting standard human recognition memory paradigms to rats, performing circumscribed brain lesions and using receiver operating characteristic methods contributed to solve this controversy. First, I describe the validation of the (...) animal ROC paradigms and report evidence that familiarity and recollection are distinct processes in intact rats. Second, I report results from rats with hippocampal dysfunction which confirm this finding and lead to the conclusion that the hippocampus supports recollection but not familiarity. Finally, I describe a recent study focusing on the medial entorhinal cortex that investigates the contribution of areas upstream of the hippocampus to recollection and familiarity. (shrink)

O lidský svět -- Samomluvy a rozhovory -- Malé řeči sváteční -- Doplňky 1 -- Doplňky 2.

Threshold- and signal-detection-based models have dominated theorizing about recognition memory. Building upon these theoretical frameworks, we have argued for a dual-process model in which conscious recollection and familiarity contribute to memory performance. In the current paper we assessed several memory models by examining the effects of levels of processing and the number of presentations on recognition memory receiver operating characteristics . In general, when the ROCs were plotted in probability space they exhibited an inverted U shape; however, when they were (...) plotted inzspace they exhibited a U shape. An examination of the ROCs showed that the dual-process model could account for the observed ROCs, but that models based solely on either threshold or signal-detection processes failed to provide a sufficient account of the data. Furthermore, an examination of subjects' introspective reports using the remember/know procedure showed that subjects were aware of recollection and familiarity and were able to consistently report on their occurrence. The remember/know data were used to accurately predict the shapes of the ROCs, and estimates of recollection and familiarity derived from the ROC data mirrored the subjective reports of these processes. (shrink)

The study discusses the paradox of the failure of the Romanian Church United with Rome, Greek-Catholic (RCUR) to assert itself after 1990, in the context of a revival of the life of all other religious communities. The significant decrease in the number of Greek-Catholic believers and the difficulties in exercising their rights are germane to the limits of democracy in Romania. No other vulnerable communities, neither immigrants, gays, Roma,nor Jehovah's Witnesses, have been denied, all this time, the protection of the (...) Romanian state, as Greek-Catholics have been. The systematic denial of the rights of the Romanian Church United with Rome (Greek-Catholic) is explained by the feature which distinguishes RCUR faithful from the members of other vulnerable communities: their organisation is perceived by the Romanian Orthodox Church (ROC) as an adversary. The Romanian Orthodox Church constantly proclaimed the illegitimacy of the RCUR in the first half of the twentieth century, and participated in its dissolution when the opportunity arose in 1948. It holds today the same explicit goal. The societal circumstances, specific to anarchic democracy, allow a major player like the ROC to impose its policy of undermining the RCUR. In accordance with Bruce Bueno de Mesquita and Alastair Smith's concept, the material and symbolic competition between the RCUR and the ROC is interpreted as an example of "bad behavior as good politics". The ROC strategy finds an optimal framework for maximizing gain in the circumstances of the Romanian anarchic democracy. (shrink)