Interspike intervals within retinal spike bursts combinatorially encode multiple stimulus features
Fig 4
Interspike interval (ISI) patterns of three-spike bursts.
Data from the cell shown in Fig 1. (A) Raster plot. The colored lines represent 3-spike bursts. The short gray lines are remaining spikes. The gray continuous line shows the normalized light intensity of the stimulus (the mean and SD are 0 and 1, respectively). (B) Distribution of ISI1 and ISI2. Each dot represents a 3-spike burst. The colored dots are bursts generated in seven different events, four of which are shown in (A) with the same color. The gray dots represent remaining bursts. (C) Variability of ISIs. Each dot represents an event. The horizontal and vertical axes are the average and SD of ISIs in an event, respectively. The gray lines show the linear fits. m1 and m2 are the intersects. (D and E) Coordinate transformation of intraburst ISIs. (D) v1 and v2 determined using Eq (1) provided in the text. Each dot represents a 3-spike burst. (E) u1 and u2 were determined by linear scaling of v1 and v2, as shown by Eq (2) provided in the text. The colors in the circle indicate the burst phases. ~1.5% of bursts are out of the range of the plot in (B), (D), and (E).