Figure 6.
PPC event-related coherence changes induced by distinct PAS protocols. The scalp distribution maps on the right part of each panel show grand average of event-related coherence transformation of all electrodes referenced to the P3 electrode (the closest electrode to PPC hot-spot), as a function of the experimental condition and Time (pre-PAS vs post-PAS) for the significantly modulated frequency band. Event-related coherence values are color coded according to the color bar. The middle part of each panel depicts ERcoh changes for a subsample of 9 electrodes surrounding the parietal end motor areas of both hemisphere for the significantly modulated frequency band. On the right for each panel, average data of the ERcoh for the C3–P3 pair before and after PAS stimulation are shown for all investigated frequencies (theta, alpha, and beta). Bars correspond to the SEM, asterisks mark significant differences (p < 0.05). A, PPC-M1PA+5ms resulted in a decrease ERcoh between C3 and central electrodes and a concurrent increase in coherence between C3 and P3. The change in ERcoh was significant for the beta band. B, PPC-M1PA−5ms resulted in a decreased ERcoh between C3 and Cz and a concurrent increase in coherence between C3 and P3. The change in ERcoh was significant for the alpha band. C, PPC-M1AP+5ms resulted in a decreased ERcoh between C3 and Cz and a concurrent increase in coherence between C3 and P3. The change in ERcoh was significant for the alpha band.