IPM - Brain Engineering Center


Seminar - SEP 19, 2016

Multiplexed neural coding using synchronous and asynchronous spikes
Monday, SEP 19, 2016 (16:00 - 17:30)
Milad Lankarany

Multiplexing – simultaneous transmission of multiple signals through a single communication channel – is used in engineered systems to increase bandwidth. I show, using simulations and experiments in rat pyramidal neurons, how multiplexing can be implemented in the brain. Among neurons receiving common input, noise desynchronized spikes driven by a slow-varying signal without desynchronizing spikes driven by a fast, episodic signal. The two signals, when applied concurrently, were more accurately reconstructed from differentially desynchronized spike trains by convolving synchronous and asynchronous spikes with their respective spike-triggered averages (i.e. demultiplexing) than by treating all spikes as equivalent, thus confirming that multiplexing occurred during encoding. We refer to the independent representation of two signals using synchronous and asynchronous spikes as synchrony-division multiplexing. For assemblies of ~30 neurons, we found that representations of fast and slow signals were maximally orthogonalized at realistic noise levels, thus demonstrating the feasibility of synchrony-division multiplexing in the brain.

The seminar will be held at the conference room of Particles and Accelerators school, IPM, Larak, Tehran


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