Figure 1
From: The brain tracks auditory rhythm predictability independent of selective attention
Illustration of the stimuli and experimental design. (a) Temporal structure of the 6-tone rhythm sequences. Total sequences duration (above) and SOA between tones (below) are indicated in milliseconds (ms). Colors (blue and red) indicate how the rhythm was dichotically presented. The configuration of which ear (left/right) received which tones (blue/red) was counterbalanced across experimental blocks. (b) Schematic illustration of the number of regular (reg.) and irregular (irr.) rhythm sequences per high- and low predictability (pred.) blocks. All possible irregular sequences are illustrated in terms of where in the sequence a deviant (D) SOA was introduced, the number of each irregular sequence, as well as the total number of irregular sequences per high- and low predictability blocks. Irregular sequences are shaded as tones from these sequences were not included in the ERP analysis. Note that the number of events presented in the experiment and the number used for analysis differs. (c) Counterbalancing within each participant; attended ear (right vs. left), dichotic configuration (redright – blueleft vs. redleft – blueright), and predictability (high vs. low) resulted in eight experimental blocks. Filled (grey) headphones indicate the attended ear, while empty (white) indicate the unattended ear. (d) Rhythm sequences illustrated according to experimental conditions. The black arrows mark the tone of interest (5th) used for the N1 analysis. Attention to tones is indicated by solid (attended) or striped (unattended) lines. Top panels represent sequences in high predictability blocks, and bottom panels the low predictability blocks (the grey circles indicate the proportion of regular and irregular sequences). Left panels illustrate the attended condition as the 5th tone appears in the attended ear (solid), while right panels illustrate the unattended condition as the tone appears in the unattended ear (striped).
