Figure 3. τ_corr propagation dynamics.

(A) Image of the exposed cortex. Pink and blue arrows indicate vector directions used to compute propagation speeds. (B–E) τ_Ocorr and τ_Rcorr values selected from arterial vector in (A) are plotted as a function of radial distance from the center of activation. (B–C) shows arterial propagation and (D–E) show parenchyma propagation. The inverse slope of the linear regression represents the onset and return propagation speed in mm/s. (F) Summary of propagation speeds computed over 5 rats. Boxes show inter-quartile range with solid line indicating the median and the dot indicating the mean value. Whiskers show the extent of the data. Onset propagation speeds in the parenchyma are excluded due to insignificant p-values (p>0.1). This indicates that any propagation that does occur in the parenchyma is faster than we can reliably measure.