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Grand average difference waves of tasks at FZ, CZ and PZ respectively. The difference wave of reappraisal (RP) was significantly smaller than suppression (SP) and viewing (VE) in 1000–3000 ms (indicated by the blue box) at FZ and CZ, while the difference wave of SP was not different from VE. Topographies showed the average amplitude differences for the contrast of VE-RP, SP-RP and VE-SP in the time window of 1000–3000 ms. (Color figure online)
