Conference Proceeding

Analysis of the Correlation between Local Field Potentials and Neuronal Firing Rate in the Motor Cortex

Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL
Conference proceedings: ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 10/2006; DOI:10.1109/IEMBS.2006.260516 pp.6185 - 6188 In proceeding of: Engineering in Medicine and Biology Society, 2006. EMBS '06. 28th Annual International Conference of the IEEE
Source: IEEE Xplore

ABSTRACT Neuronal firing rate has been the signal of choice for invasive motor brain machine interfaces (BMI). The use of local field potentials (LFP) in BMI experiments may provide additional dendritic information about movement intent and may improve performance. Here we study the time-varying amplitude modulated relationship between local field potentials (LFP) and single unit activity (SUA) in the motor cortex. We record LFP and SUA in the primary motor cortex of rats trained to perform a lever pressing task, and evaluate the correlation between pairs of peri-event time histograms (PETH) and movement evoked local field potentials (mEP) at the same electrode. Three different correlation coefficients were calculated and compared between the neuronal PETH and the magnitude and power of the mEP. Correlation as high as 0.7 for some neurons occurred between the PETH and the mEP magnitude. As expected, the correlations between the single trial LFP and SUV are much lower due to the inherent variability of both signals

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Keywords

BMI experiments
 
correlations
 
different correlation coefficients
 
electrode
 
inherent variability
 
invasive motor brain machine interfaces
 
lever
 
local field potentials
 
motor cortex
 
movement evoked local field potentials
 
movement intent
 
Neuronal
 
neuronal PETH
 
pairs
 
peri-event time histograms
 
primary motor cortex
 
signals
 
SUV
 
time-varying amplitude modulated relationship