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. 2014 Sep 5;9(9):e106860. doi: 10.1371/journal.pone.0106860

Figure 1. Example trials of the monetary and picture conditioning phase and the visual discrimination paradigm.

Figure 1

(A) Monetary conditioning phase. On each trial, participants responded to the brief presentation of a small square within a noise square as quickly and accurately as possible. After each response, they received a monetary outcome that was positive, neutral or negative (e.g., −50 cents, in the Figure; US). The outcome was presented concurrently with a particular sound (CS). (B) Picture conditioning phase. On each trial, participants were presented with a picture (US) in synchrony with a particular sound (CS). After a variable temporal interval, two or three yellow dots were superimposed onto the picture. Participants reported the number of dots. (C) 2-AFC visual discrimination phase. On each trial, participants were presented with a near-threshold Gabor in synchrony with one of the conditioned sounds (CS). They discriminated whether the Gabor was presented in their left or right hemifield.