Abstract
Abnormally-synchronized, high-voltage spindles (HVSs) are associated with motor deficits in 6-hydroxydopamine-lesioned parkinsonian rats. The non-stationary, spike-and-wave HVSs (5-13 Hz) represent the cardinal parkinsonian state in the local field potentials (LFPs). Although deep brain stimulation (DBS) is an effective treatment for the Parkinson’s disease, continuous stimulation results in cognitive and neuropsychiatric side effects. Therefore, an adaptive stimulator able to stimulate the brain only upon the occurrence of HVSs is demanded. This paper proposes an algorithm not only able to detect the HVSs with low latency but also friendly for hardware realization of an adaptive stimulator. The algorithm is based on autoregressive modeling at interval, whose parameters are learnt online by an adaptive Kalman filter. In the LFPs containing 1131 HVS episodes from different brain regions of four parkinsonian rats, the algorithm detects all HVSs with 100% sensitivity. The algorithm also achieves higher precision (96%) and lower latency (61 ms), while requiring less computation time than the continuous wavelet transform method. As the latency is much shorter than the mean duration of an HVS episode (4.3 s), the proposed algorithm is suitable for realization of a smart neuromodulator for mitigating HVSs effectively by closed-loop DBS.
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Abbreviations
- AKF:
-
Adaptive Kalman filter
- AR:
-
Autoregressive model
- cDBS:
-
Closed-loop deep brain stimulation
- CWT:
-
Continuous wavelet transform
- DBS:
-
Deep brain stimulation
- FN:
-
False negative
- FP:
-
False positive
- FPGA:
-
Field-programmable gate array
- HHT:
-
Hilbert-Huang transform
- HVS:
-
High-voltage spindle
- LFP:
-
Local field potential
- ML:
-
Machine-learning
- PACF:
-
Partial autocorrelation function
- PD:
-
Parkinson’s disease
- PSD:
-
Power spectral density
- SNR:
-
Signal-to-noise ratio
- TP:
-
True positive
- TR:
-
Detection threshold
- 6-OHDA:
-
6-Hydroxydopamine
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Acknowledgments
The authors gratefully acknowledge the support from the National Health Research Institute [Grant No. NHRI-EX105-10430NI] and the Ministry of Science and Technology [Grant No. MOST 106-2622-8-007-014 -TA] in Taiwan.
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Perumal, R., Vigneron, V., Chuang, CF. et al. A Computationally-Efficient, Online-Learning Algorithm for Detecting High-Voltage Spindles in the Parkinsonian Rats. Ann Biomed Eng 48, 2809–2820 (2020). https://doi.org/10.1007/s10439-020-02680-0
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DOI: https://doi.org/10.1007/s10439-020-02680-0