Abstract
Computational analysis of communication efficiency of brain networks often relies on graph-theoretic measures based on the shortest paths between network nodes. Here, we explore a communication scheme that relaxes the assumption that information travels exclusively through optimally short paths. The scheme assumes that communication between a pair of brain regions may take place through a path ensemble comprising the k-shortest paths between those regions. To explore this approach, we map path ensembles in a set of anatomical brain networks derived from diffusion imaging and tractography. We show that while considering optimally short paths excludes a significant fraction of network connections from participating in communication, considering k-shortest path ensembles allows all connections in the network to contribute. Path ensembles enable us to assess the resilience of communication pathways between brain regions, by measuring the number of alternative, disjoint paths within the ensemble, and to compare generalized measures of path length and betweenness centrality to those that result when considering only the single shortest path between node pairs. Furthermore, we find a significant correlation, indicative of a trade-off, between communication efficiency and resilience of communication pathways in structural brain networks. Finally, we use k-shortest path ensembles to demonstrate hemispherical lateralization of efficiency and resilience.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments of comparable ethical standards.
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B.M. was supported by a Natural Science and Engineering Research Council of Canada postdoctoral fellowship. A.G. and P.H. were supported by the Swiss National Science Foundation (#310030-156874, NCCR-Synapsy 51AU40_125759), the Center for Biomedical Imaging (CIBM) of the Geneva-Lausanne Universities and EPFL, Leenaards Foundation, and Louis-Jeantet Foundation. J.G. was supported by the National Institute of Health (1R01 MH108467-01). O.S. was supported by the J.S. McDonnell Foundation (220020387), the National Science Foundation (1212778), and the National Institutes of Health (R01 AT009036-01).
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Avena-Koenigsberger, A., Mišić, B., Hawkins, R.X.D. et al. Path ensembles and a tradeoff between communication efficiency and resilience in the human connectome. Brain Struct Funct 222, 603–618 (2017). https://doi.org/10.1007/s00429-016-1238-5
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DOI: https://doi.org/10.1007/s00429-016-1238-5