, 2008). A plausible explanation of our results is that ISS in motor regions is driven by rhythmic components of the stimulus. Our study adds to this literature
by showing that these motor planning regions are synchronized between subjects during a natural musical experience, and are likely time-locked to structural (e.g. rhythmic) components of the stimulus. One possible explanation for this connection with motor systems is that, over the course of human evolution, music has traditionally been used in conjunction with synchronized movement and dance (McNeill, 1995; Levitin, 2008). Our study provides new information regarding inter-subject brain find protocol synchronization in response to natural stimuli. Our results show that inter-subject synchronization occurs at multiple levels in the information processing hierarchy – from sub-cortical and cortical auditory structures to fronto-parietal attention network and motor planning areas. Importantly, we show for the first time that this diverse collection of auditory and supra-auditory brain structures tracks aspects of musical structure over extended periods of time. More generally, our findings demonstrate MS-275 order that music listening elicits consistent and reliable patterns of time-locked
brain activity in response to naturalistic stimuli that extends well beyond primary sensory cortices (Hasson et al., 2004; Wilson et al., 2008), and that synchronization is not driven solely by low-level acoustical cues. These signatures of synchronized brain activity across individuals in multiple hierarchically structured systems may underlie shared neural representations that facilitate our collective social capacity for listening and attending to music. This work was supported by the NIH (F32 DC010322-01A2 to D.A.A., 1R21DC011095 to V.M.), National Science Foundation Buspirone HCl (BCS0449927 to V.M. and D.J.L.), and Natural
Sciences and Engineering Research Council of Canada (228175-2010 to D.J.L.). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Abbreviations AG angular gyrus fMRI functional magnetic resonance imaging GLM general linear model HG Heschl’s gyrus IC inferior colliculus IFG inferior frontal gyrus IPS intra-parietal sulcus ISS inter-subject synchronization MCC mid-cingulate cortex MGN medial geniculate nucleus PGa and PGp anterior and posterior sub-divisions of the angular gyrus PMC premotor motor cortex PP planum polare pSMG posterior supramarginal gyrus pSTG posterior superior temporal gyrus PT planum temporale Fig. S1. Differences between ISS and GLM approaches for the analysis of music processing in the brain. Fig. S2. Flow chart for ISS Analysis. Synchronization was calculated by computing Pearson correlations between the voxel time series in each pair of subjects (136 subject-to-subject comparisons total).
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