Journal: The Journal of neuroscience : the official journal of the Society for Neuroscience

Article Title: Network rhythms influence the relationship between spike-triggered local field potential and functional connectivity

doi: 10.1523/JNEUROSCI.1856-11.2011

Figure Lengend Snippet: No traveling waves in V1. (A-B) Same as the plots shown in Figure 2A-B, but for LFP filtered between 15-90 Hz. (C) Upper plot shows the time of the positive peak between 0 – 200 ms in the STA filtered between 3-90 Hz (as shown in Figure 2C), as a function of cortical distance between spike and LFP electrodes. Lower plot shows the positive peak in the STA between -200 – 0 ms. (D) Histogram of time-to-peak negativity values for all inter-electrode distances up to 0.8 mm (left) or at 0.4 mm (right). The red lines show the best fitting bimodal Gaussian distribution (see Results for details). For the right plot, the peak near 0 ms has a value of 0.16 (truncated at 0.1 to highlight the second peak) (E-H) Same as (A-D) for 60 electrodes in Monkey 2. For the histograms (H), the peaks of the Gaussians near time zero had values of 0.25 and 0.43, which were truncated at 0.1 to highlight the second peak near ∼25 ms.

Article Snippet: These distributions were fitted with either a unimodal or a bimodal Gaussian distribution (using the gmdistribution function in Matlab) and the Akaike information criterion (AIC) was used as a measure of the goodness of fit.

Techniques:

Journal: The Journal of neuroscience : the official journal of the Society for Neuroscience

Article Title: Network rhythms influence the relationship between spike-triggered local field potential and functional connectivity

doi: 10.1523/JNEUROSCI.1856-11.2011

Figure Lengend Snippet: A mechanism that explains both the shift in the negative peak of the STA as well as its onset before time zero. A) The LFP has an ongoing oscillation at 8 Hz and spikes tend to occur 25 ms before its negative peak. The STA of the reference electrode (black trace) shows the contribution of the spike (sharp Gaussian with SD of 2 ms centered at zero) and of the 8 Hz rhythm. The degree of phase locking determines the relative magnitudes of the two sources (arbitrarily chosen to be 0.4 and 0.08 for the spike transient and alpha rhythm). These two sources fall off at different rates with distance (d), depending on the degree of synchronization in the spikes and phase consistency of the alpha rhythm (space constants arbitrarily chosen to be 0.3 and 3 mm for the spike transient and alpha rhythm). B) Same data as in A, but filtered between 3-90 Hz, which decreases the spike transient but not the alpha rhythm. C) Same as in A, filtered between 3-20 Hz. D) STA (filtered between 3-90 Hz) for which spikes occur 10 ms before the negative peak of the rhythm. The spike transient (before filtering) and the rhythm both have a magnitude of 0.1.

Article Snippet: These distributions were fitted with either a unimodal or a bimodal Gaussian distribution (using the gmdistribution function in Matlab) and the Akaike information criterion (AIC) was used as a measure of the goodness of fit.

Techniques: