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. 2009 Nov 4;29(44):13785–13796. doi: 10.1523/JNEUROSCI.2390-09.2009

Figure 3.

Figure 3.

Linear estimation of LFPs for all electrodes. A, LFP time course estimations based on trial-specific W–K filters (see Results and Fig. 1A). Each 4 min trial was split into two segments: one of these was used to build the W–K filter, and the other segment was used to compute the LFP estimate. Each vertical bar reports the mean estimation accuracy (labeled r throughout text) for all test trials in one electrode, and error bars represent 1 SEM (5 trials). The data are blocked according to recording session (S) and monkey (M). The black squares represent the mean reconstruction accuracy obtained when the same data were used to compute the filter and reconstruct the LFP (see Materials and Methods). The triangles indicate the estimation accuracy obtained under the null hypothesis using random spike trains with the same firing rates (see Materials and Methods, Performance measures). *p < 0.01 based on a two-tailed t test comparing the estimation accuracies against the null hypothesis. The dashed line indicates the average estimation accuracy (r̄) across all electrodes and all monkeys (r̄ = 0.36 ± 0.15, n = 109). The dark gray dotted line indicates the average reconstruction accuracy [average of the black squares (r̄ = 0.39 ± 0.12, n = 109)]. The light gray dotted line indicates the average estimation accuracy under the null hypothesis (average of the triangles, r̄rand = 0.001 ± 0.035, n = 109). B, LFP time course estimations based on electrode-specific W–K filters (see Results and Fig. 1B). For each electrode, half of the trials were used to compute the W–K filter, and the spike trains in the remaining trials were used to estimate the LFP (Fig. 1B). Each bar shows the estimation accuracy for a different electrode averaged over the trials used to estimate the LFP (error bars denote 1 SEM). The conventions are the same as in A. Only those electrodes with firing rate >5 spikes/s and CV > 1 are shown here and in subsequent figures (n = 88 electrodes of the total of 109 electrodes). C, LFP time course estimations based on monkey-specific filters (see Results and Fig. 1C). For each monkey, the data from half of the electrodes were used to compute the W–K filter, and the spike trains from the remaining electrodes were used to estimate the LFP. For each recording session, here we show the average estimation accuracy across all the electrodes used to estimate the LFP (error bars denote 1 SEM). The conventions are the same as in A. The number of electrodes recorded in each session is indicated above each bar. The monkey-specific W–K filters are shown for each recording session.