Neural Comput - Continuous closed-loop decoder adaptation with a recursive maximum likelihood algorithm allows for rapid performance acquisition in brain-machine interfaces.

Tópicos

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Resumo

Closed-loop decoder adaptation (CLDA) is an emerging paradigm for both improving and maintaining online performance in brain-machine interfaces (BMIs). The time required for initial decoder training and any subsequent decoder recalibrations could be potentially reduced by performing continuous adaptation, in which decoder parameters are updated at every time step during these procedures, rather than waiting to update the decoder at periodic intervals in a more batch-based process. Here, we present recursive maximum likelihood (RML), a CLDA algorithm that performs continuous adaptation of a Kalman filter decoder's parameters. We demonstrate that RML possesses a variety of useful properties and practical algorithmic advantages. First, we show how RML leverages the accuracy of updates based on a batch of data while still adapting parameters on every time step. Second, we illustrate how the RML algorithm is parameterized by a single, intuitive half-life parameter that can be used to adjust the rate of adaptation in real time. Third, we show how even when the number of neural features is very large, RML's memory-efficient recursive update rules can be reformulated to also be computationally fast so that continuous adaptation is still feasible. To test the algorithm in closed-loop experiments, we trained three macaque monkeys to perform a center-out reaching task by using either spiking activity or local field potentials to control a 2D computer cursor. RML achieved higher levels of performance more rapidly in comparison to a previous CLDA algorithm that adapts parameters on a more intermediate timescale. Overall, our results indicate that RML is an effective CLDA algorithm for achieving rapid performance acquisition using continuous adaptation.

Resumo Limpo

closedloop decod adapt clda emerg paradigm improv maintain onlin perform brainmachin interfac bmis time requir initi decod train subsequ decod recalibr potenti reduc perform continu adapt decod paramet updat everi time step procedur rather wait updat decod period interv batchbas process present recurs maximum likelihood rml clda algorithm perform continu adapt kalman filter decod paramet demonstr rml possess varieti use properti practic algorithm advantag first show rml leverag accuraci updat base batch data still adapt paramet everi time step second illustr rml algorithm parameter singl intuit halflif paramet can use adjust rate adapt real time third show even number neural featur larg rmls memoryeffici recurs updat rule can reformul also comput fast continu adapt still feasibl test algorithm closedloop experi train three macaqu monkey perform centerout reach task use either spike activ local field potenti control d comput cursor rml achiev higher level perform rapid comparison previous clda algorithm adapt paramet intermedi timescal overal result indic rml effect clda algorithm achiev rapid perform acquisit use continu adapt

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