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. 2017 Sep 28;5:e3839. doi: 10.7717/peerj.3839

Figure 5. Topographic distribution of alpha PPs following a minor stroke.

Figure 5

The group mean alpha PPs in the subacute (n = 10) and chronic (n = 9) stages of stroke patients vs. healthy controls (n = 11). We have shown that the frontal cortex generally exhibits the greatest PP differences related to a slower alpha than all the other EEG channels in both the subacute (A) and chronic stages of stroke patients (B) vs. the controls, particularly at F4 (the red dashed circle). The persistence of stroke induced alpha PPs differences was additionally confirmed by the almost non-existing PP differences between the subacute and chronic stages of the stroke patients (C). This result indicates that the newly emerged slower alpha in stroke patients might be related to the confirmed neuropathology of an ischemic stroke. Thick circles: the mean PPs; thin circles: the mean PPs ± SDs. Solid line: 0°< PP < 180°; dashed: −180°< PP < 0°. Referential circle with PP = 60°, drawn in the lower right corner. According to the angular nature of PP, the large solid circles (e.g., +175°) have similar PP values to the large dashed circles (e.g., −179°).