EEG power spectral density derived Brain Asymmetry Index (pdBSI). The difference between pdBSI estimated in young ischemic (Yi, n = 7) and middle-aged ischemic (Mi, n = 7) rats was significant during the acute phase (at M15, H1) and during the chronic phase of ischemia (at D3, D7, D14). Mean ± SEM. * Yi vs. Mi (Mann–Whitney test); ^ Yi vs YT0; “ Mi vs. MT0 (Wilcoxon matched pairs test). Time sessions are as in Figure 1. Significant difference at P < 0.05.