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Information centrality and ordering of nodes for accuracy in noisy decision-making networks

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Ioannis Poulakakis, George Forrest Young, Luca Scardovi, Naomi Ehrich Leonard

(2016), *IEEE Transactions on Automatic Control*, vol. 61, no.4, pp. 1040-1045.

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This paper considers a network of stochastic evidence accumulators, each represented by
a drift-diffusion model accruing evidence towards a decision in continuous time by observing a noisy
signal and by exchanging information with other units according to a fixed communication graph.
These network dynamics model distributed sequential hypothesis testing as well as collective
decision making. We prove the relationship between the location of each unit in the graph and
its certainty as measured by the inverse of the variance of its state. Under mild connectivity
assumptions, we show that only in balanced directed graphs do the node variances remain within
a bounded constant from the minimum possible variance. We then prove that, for these digraphs,
node ranking based on certainty is governed by information centrality, which depends on the notion
of effective resistance suitably generalized to directed graphs. Our results, which describe the
certainty of each unit as a function of the structural properties of the graph, can guide the
selection of leaders in problems that involve the observation of noisy external signals by a
cooperative multi-agent network.

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