scholarly journals A new method for current source density estimation from local field potentials and optical imaging data

2009 ◽  
Vol 3 ◽  
Author(s):  
Erdi Peter
Keyword(s):  
Optical Imaging ◽  
Density Estimation ◽  
Local Field ◽  
Current Source ◽  
Local Field Potentials ◽  
Current Source Density ◽  
New Method ◽  
Field Potentials ◽  
Imaging Data ◽  
Source Density

scholarly journals Sensing Local Field Potentials with a Directional and Scalable Depth Array: DISC

2021 ◽  
Author(s):  
Amada Abrego Mancilla ◽  
Wasif Khan ◽  
Christopher E Wright ◽  
Neela Prajapati ◽  
M Rabiul Islam ◽  
...  
Keyword(s):  
Local Field ◽  
Barrel Cortex ◽  
Current Source ◽  
Local Field Potentials ◽  
Brain Targeting ◽  
Directional Sensitivity ◽  
Cortical Region ◽  
Field Potentials ◽  
Electromagnetic Modeling ◽  
Functional Therapy

A variety of electrophysiology tools are available to the neurosurgeon for diagnosis, functional therapy, and neural prosthetics. However, no tool can currently address these three critical recording needs: (i) a surgical method that can reach any cortical region in a minimally invasive manner; (ii) record microscale, mesoscale, and macroscale resolutions simultaneously; and (iii) enable recording from multiple brain regions. This work presents a novel device for recording local field potentials (LFPs) whose form is based on state-of-the-art stereo-electroencephalogram (sEEG). Using quasi-static electromagnetic modeling, the lead body is shown to shield LFP sources and this enables directional sensitivity and scalability when microelectrodes are positioned radially, which we refer to as a DISC array. As predicted, DISC demonstrated significantly improved signal-to-noise, directional sensitivity, and decoding accuracy in the rat barrel cortex during whisker stimulation. Critically, DISC also demonstrated equivalent fidelity at the macroscale and, uniquely, performs current source density in stereo. Directional sensitivity of LFPs may significantly improve brain-computer interfaces and many diagnostic procedures, including epilepsy foci detection and deep brain targeting.

scholarly journals ZapLine: a simple and effective method to remove power line artifacts

2019 ◽  
Author(s):  
Alain de Cheveigné
Keyword(s):  
Local Field ◽  
Local Field Potentials ◽  
Real Data ◽  
Spatial Filtering ◽  
Power Line ◽  
New Method ◽  
Field Potentials ◽  
Simple Method ◽  
Multichannel Data ◽  
Human Electrophysiology

AbstractPower line artifacts are the bane of animal and human electrophysiology. A number of methods are available to help attenuate or eliminate them, but each has its own set of drawbacks. In this brief note I present a simple method that combines the advantages of spectral and spatial filtering, while minimizing their downsides. This method is applicable to multichannel data such as electroencephalography (EEG), magnetoencephalography (MEG), or multichannel local field potentials (LFP). I briefly review past methods, pointing out their drawbacks, describe the new method, and evaluate the outcome using synthetic and real data.

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