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| Home > Publications database > Localization of coherent activity based on multi-electrode local field potentials |
| Abstract | FZJ-2019-04915 |
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2019
Abstract: Deep brain stimulation (DBS) of the subthalamic nucleus (STN) is an established method for the suppression of motor deficits in Parkinson's disease. The efficacy and the extent of side effects of DBS depend critically on the positioning of the stimulation electrode. In particular with the increased use of directional DBS, it is becoming more difficult to find optimal stimulation parameters. A major challenge during the positioning of DBS electrodes is the detection of hotspots associated with the generation of pathological coherent activity. Here, we develop and test a method aiming at localizing confined regions of coherent activity based on the local field potential (LFP) recorded with multiple electrodes (see figure). Our approach involves two steps, the identification of coherent sources by independent-component analysis of the multi-channel recordings in Fourier space, and the localization of identified sources by means of current-source-density analysis. We benchmark this technique for a range of source sizes and source-electrode distances based on synthetic ground-truth data generated by multicompartment models of STN neurons with realistic morphology. In this framework, we show that the spatio-temporal structure of the LFP recorded with multiple electrodes can be exploited to achieve a localization precision exceeding the spatial resolution of the electrode configuration. The proposed method permits a continuous tracking of source positions and may therefore provide a tool to study the spatio-temporal organization of pathological activity in STN. Moreover, it could serve as an intra-operative guide for the positioning of DBS electrodes and thereby improve and speed up the implantation process and the adjustment of stimulus parameters.
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