Input coding for neuro-electronic hybrid systems

George, Jude Baby and Abraham, Grace Mathew and Singh, Katyayani and Ankolekar, Shreya M and Amrutur, Bharadwaj and Sikdar, Sujit Kumar (2014) Input coding for neuro-electronic hybrid systems. In: BIOSYSTEMS, 126 . pp. 1-11.

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Abstract

Liquid State Machines have been proposed as a framework to explore the computational properties of neuro-electronic hybrid systems (Maass et al., 2002). Here the neuronal culture implements a recurrent network and is followed by an array of linear discriminants implemented using perceptrons in electronics/software. Thus in this framework, it is desired that the outputs of the neuronal network, corresponding to different inputs, be linearly separable. Previous studies have demonstrated this by either using only a small set of input stimulus patterns to the culture (Hafizovic etal., 2007), large number of input electrodes (Dockendorf et al., 2009) or by using complex schemes to post-process the outputs of the neuronal culture prior to linear discriminance (Ortman et al., 2011). In this study we explore ways to temporally encode inputs into stimulus patterns using a small set of electrodes such that the neuronal culture's output can be directly decoded by simple linear discriminants based on perceptrons. We demonstrate that network can detect the timing and order of firing of inputs on multiple electrodes. Based on this, we demonstrate that the neuronal culture can be used as a kernel to transform inputs which are not linearly separable in a low dimensional space, into outputs in a high dimension where they are linearly separable. Thus simple linear discriminants can now be directly connected to outputs of the neuronal culture and allow for implementation of any function for such a hybrid system. (C) 2014 Published by Elsevier Ireland Ltd.

Item Type:	Journal Article
Publication:	BIOSYSTEMS
Publisher:	ELSEVIER SCI LTD
Additional Information:	Copy right for this article belongs to the ELSEVIER SCI LTD, ENGLAND
Keywords:	Cultured neural networks;LSM;Temporal encoding;Neuro-electronic hybrid systems
Department/Centre:	Division of Biological Sciences > Centre for Neuroscience Division of Biological Sciences > Molecular Biophysics Unit Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	19 Aug 2016 10:23
Last Modified:	19 Aug 2016 10:23
URI:	http://eprints.iisc.ac.in/id/eprint/54416

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