Fig. 1: Paradigm outline and stimulus characteristics.
From: Inharmonicity enhances brain signals of attentional capture and auditory stream segregation
A provides a symbolic representation of a roving sequence in the harmonic condition. The fundamental frequency is shown in blue or red, while the upper harmonics are shown in gray. Shades of red represent theoretical deviants, which progressively become standards (blue). B presents the waveform and C presents the spectrum of an example harmonic sound (F0 = 500 Hz). Similarly, D–F show sequence representation, waveform and spectrum for the inharmonic condition. Notice that while the distribution of the partials becomes uneven in the inharmonic condition, the pattern of jittering is carried through from one fundamental frequency to the next. Conversely, G shows the sequence representation for the changing condition, where a different jittering pattern is applied to each sound. H shows entropy calculations for harmonic (dashes) and inharmonic (violin plot distributions) sounds for each F0. Note that while we calculated entropies for 1000 different inharmonic sounds present in our sound pool, there was only one harmonic sound for each frequency (thus producing a single entropy value instead of a distribution).
