17ZH1100, Real-time bi-directional interfacing of neuron-computer and biomimetic synapse technology,
Jung Sang Don
Abstract
In neural engineering studies, electrical stimulation feedback which is in response to measured neural activities from biological systems has important roles for mimicking artificial sensorymotor feedback paths and for controlling neural circuit plasticity. In previous works, a host PC in a closed-loop signal processing path resulted in uncontrollable milliseconds latency between a spike detection and an electrical stimulus. In this paper, we present an event-based delay-controlled stimulator controller with a priority queue in a real-time closed-loop bidirectional neural interface system. Event-based communication using an events table supports arbitrary feedback connections mapping to a biological system. Simplified event paths result in average 481.3 ns latency with few clock cycles jitter. In addition, axonal conduction delay is implemented using a priority queue with controllable jitter in a global timer temporal resolution. Precisely-controlled axonal conduction delay enables spatiotemporal pattern stimulation.
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