Synchrony in Silicon: The Gamma Rhythm

Synchrony in Silicon: The Gamma Rhythm

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by John V. Arthur , Kwabena A. Boahen

Venue:	IEEE TRANSACTIONS ON NEURAL NETWORKS
Citations:	3 - 1 self

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@MISC{Arthur_synchronyin,
    author = {John V. Arthur and Kwabena A. Boahen},
    title = {Synchrony in Silicon: The Gamma Rhythm},
    year = {}
}

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Abstract

In this paper, we present a network of silicon interneurons that synchronize in the gamma frequency range (20–80 Hz). The gamma rhythm strongly influences neuronal spike timing within many brain regions, potentially playing a crucial role in computation. Yet it has largely been ignored in neuromorphic systems, which use mixed analog and digital circuits to model neurobiology in silicon. Our neurons synchronize by using shunting inhibition (conductance based) with a synaptic rise time. Synaptic rise time promotes synchrony by delaying the effect of inhibition, providing an opportune period for interneurons to spike together. Shunting inhibition, through its voltage dependence, inhibits interneurons that spike out of phase more strongly (delaying the spike further), pushing them into phase (in the next cycle). We characterize the interneuron, which consists of soma (cell body) and synapse circuits, fabricated in a 0.25-µm

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