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. 2017 Apr 13;12(4):e0175631. doi: 10.1371/journal.pone.0175631

Fig 4. Grand-average ERP waveforms transitions between neutral and happy or neutral and frightened facial expressions.

Fig 4

Blue trace = neutral-frightened, black trace = neutral-happy, red trace = frightened-neutral, green trace = happy-neutral. Positive upwards.