Figure 1.

(a) We compared “simple” monophone sounds with “complex” triads, in two different contexts: A reinforcement context with CS+ (reinforced) and CS− (nonreinforced), and a nonreinforcement context with neutral sounds (NS) in which participants were explicitly instructed about the absence of the US. Frequencies are shown for each bass tone. Dashed lines signify the root of each triad that served as discriminative spectral feature between two chords. (b) Block order in the fMRI experiment, and intra‐trial procedure