Fig. 1.

(A) Illustration showing three of 16 tones of the static stimulus sequence. The five horizontal lines illustrate the fundamental (lower line) and the four harmonics. (B) Illustration showing three of 16 tones of the frequency-modulated stimulus sequence. The middle tone is the target. (C) Illustration of the moving stimulus, bird's-eye view. The numbers and the dotted arrows depict the order of appearance of the tones. The red circle illustrates the target (the fifth tone in this particular example). (D) fMRI paradigm. Each stimulus block lasted for 8 s. As soon as the 8-s stimulus ended, image acquisition was initiated.