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• W1982487339 startingPage "e82141" @default.
• W1982487339 abstract "Extracellular (EC) recordings of action potentials from the intact brain are embedded in background voltage fluctuations known as the “local field potential” (LFP). In order to use EC spike recordings for studying biophysical properties of neurons, the spike waveforms must be separated from the LFP. Linear low-pass and high-pass filters are usually insufficient to separate spike waveforms from LFP, because they have overlapping frequency bands. Broad-band recordings of LFP and spikes were obtained with a 16-channel laminar electrode array (silicone probe). We developed an algorithm whereby local LFP signals from spike-containing channel were modeled using locally weighted polynomial regression analysis of adjoining channels without spikes. The modeled LFP signal was subtracted from the recording to estimate the embedded spike waveforms. We tested the method both on defined spike waveforms added to LFP recordings, and on in vivo-recorded extracellular spikes from hippocampal CA1 pyramidal cells in anaesthetized mice. We show that the algorithm can correctly extract the spike waveforms embedded in the LFP. In contrast, traditional high-pass filters failed to recover correct spike shapes, albeit produceing smaller standard errors. We found that high-pass RC or 2-pole Butterworth filters with cut-off frequencies below 12.5 Hz, are required to retrieve waveforms comparable to our method. The method was also compared to spike-triggered averages of the broad-band signal, and yielded waveforms with smaller standard errors and less distortion before and after the spike." @default.
• W1982487339 created "2016-06-24" @default.
• W1982487339 creator A5015227963 @default.
• W1982487339 creator A5041504992 @default.
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• W1982487339 date "2013-12-31" @default.
• W1982487339 modified "2023-10-16" @default.
• W1982487339 title "Estimating Extracellular Spike Waveforms from CA1 Pyramidal Cells with Multichannel Electrodes" @default.
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• W1982487339 doi "https://doi.org/10.1371/journal.pone.0082141" @default.
• W1982487339 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3876992" @default.
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