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. 2018 Oct 16;9:47–62. doi: 10.1016/j.isci.2018.10.009

Figure 2.

Figure 2

Spike-Field Coherence in an Exemplary Tracking Unit

(A) Left: Spike-triggered averages (STAs; solid lines: median; shaded areas: IQR) obtained from a representative tracker (same shown in Figure 1A) in response to a modulation frequency of 3.25 Hz. Dark traces show the STA calculated with real spike times (thin black curve, raw median STA; thick gray curve, 4–8 Hz filtered median STA, shown for illustrative purposes). Red and orange traces represent the raw median STA calculated with randomly centered LFP windows (random-triggered average [RTA]; red trace, raw median RTA; thick orange curve, 4–8 Hz filtered median RTA). Right: same as in left, but obtained in response to a modulation frequency of 157.49 Hz.

(B) Power spectral density of the STAs (black) and RTAs (red) obtained from data shown in (A) (left, 3.25 Hz; right, 157.59 Hz).

(C) Average power of the LFP windows centered at spike times (spike-triggered power [STP], black traces), and at random time points (random-triggered power [RTP], red traces). Left and right columns follow above-described conventions.

(D) Spike-field coherence (SFC, black traces) and random-field coherence (RFC, red traces), at two modulation frequencies (left column, 3.25 Hz; right column, 157.59 Hz). Insets show the z-normalization of the median SFC with respect to the RFC (baseline). Data in the figure are shown as median (solid lines) and IQR (shaded areas) across repetitions (300 in total) in the coherence analysis (See Transparent Methods).