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. 2012 Feb 20;7(2):e31983. doi: 10.1371/journal.pone.0031983

Figure 1. Experimental paradigm. Following a 500 ms warning signal (+), the Stroop stimuli was presented.

Figure 1

The distractor word (positive, negative or depression-related) was presented for 200 ms, and the target face (positive or negative) was present for no more than 1000 ms. Subjects were asked to identify the valence of faces while ignoring words overlaid on them within 2000 ms. The target face and the following blank will disappear after the response. The inter-stimulus interval (ISI) was 1000 ms. Emotional incongruent (EI) trials consisted of faces and words with opposing valence, and emotional congruent (EC) trials consisted of faces and words with identical valence. Faces were presented in color and words in blue.