Journal: The Journal of neuroscience : the official journal of the Society for Neuroscience
Article Title: The spiking component of oscillatory extracellular potentials in the rat hippocampus
doi: 10.1523/JNEUROSCI.0656-12.2012
Figure Lengend Snippet: A, Illustration of the model. 9416 pyramidal cells were randomly distributed with their soma centers in a 40 μm thick circular disk with 1mm diameter. Ve’s were calculated along a virtual electrode shank oriented along the central axes of the disk. Layer abbreviations: o, stratum oriens; p, stratum pyramidale; r, stratum radiatum; lm, stratum lacunosum-moleculare. B, Extracellular potentials in stratum pyramidale arising from AP currents in randomly and rhythmically spiking populations with varying modulation frequency and three different average firing rates (2, 4, 6% per 10 ms). Histograms of APs are shown above the corresponding voltage traces. C, Averaged FFT power spectra over 25 trials for Ve in stratum pyramidale. Spectra are shown for each case from panel B and for two additional frequencies (250 and 350 Hz). Note that the unmodulated spiking spectra (grayscale in B) are not visible because the maximum value at the most active case shown is 2.2×10−7. Power spectral densities (psd) throughout the manuscript were estimated using the multitaper method with a time-bandwidth product of 4 and an 8192-point FFT (Percival and Walden, 1993), so the arbitrary psd units (a.u.) are consistent in all figures.
Article Snippet: Event peaks were extracted by taking the maxima of the 140–210 Hz pyramidal layer CSD and enforcing a minimum separation between event peaks of 50 ms. 100 ms segments of the wideband LFP signal around these event peaks were then analyzed further using the multitaper FFT in the Matlab signal processing toolbox (see also Mitra and Pesaran, 1999 ).
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