This research poster presented by N. Titova, E. Kuzmina, G. Soghoyan, and M. Lebedev investigates the temporal dynamics of cortical stereotactic EEG activity during the observation and execution of bionic hand gestures. The study re-evaluates previous prominent claims that neural population dynamics are fundamentally rotational, proposing instead that such rotational patterns in multidimensional space are equivalent to neuronal travelling waves or sequences. Experimentally, eight to twelve stereotactic EEG channels and two electromyography channels were recorded at two kilohertz from thirty epilepsy patients as they maintained extended palm positions or flexed fingers matching nine distinct movements of a bionic hand. The results demonstrate that rotational dynamics observed via statistical dimensionality reduction methods correlate directly with the presence of travelling waves across the cortex. Spectral analysis further revealed that slow electroencephalographic rhythms predominate during movement preparation, while gamma and high-gamma rhythms are strongly pronounced during movement execution, mirroring electromyographic activity. Overall, the findings indicate that population-level rotational dynamics can be explained by multichannel travelling waves across specific spectral bands, offering relevant insights for the design and refinement of neuroprosthetic systems.

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