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Role of feed forward and recurrent inhibition and excitation in the emergence of winner take all (WTA) behavior in a neuromorphic chip Massimiliano Versace & Elisabetta Chicca • WTA is a desirable properties in neural circuits that need to perform a ‘choice’, or code compression, from an input layer to an output (or coding) layer • Target of the study: study WTA behavior in the IFSLWTA (Integrate-and-fire-stop-learning-winner-take-all) chip. 5 EXPERIMENTS (1) (2) … (3) … BASELINE FEED FORWARD INHIBITION (4) (5) … FEED FORWARD AND FEED BACK INHIBITION … FEED BACK INHIBITION Legend … FEED FORWARD,FEED BACK INHIBITION AND RECURRENT EXCITATION Excitatory cell Inhibitory connection Inhibitory cell Excitatory connection External stimulation Recurrent excitatation Results BASELINE winner FEED FORWARD AND FEED BACK INHIBITION WITH RECURRENT EXCITATION This preliminary study explores a subset of excitatory and inhibitory parameters in the IFSLWTA chip that allows the emergence of WTA behavior through competitive on-center (excitatory)/off-surround (inhibitory) interactions. THEY EXIST!! WTA is a useful property: code compression, or a ‘choice’ among excitatory neurons, can be used to learn compressed representations. For example: ocular dominance columns in visual cortex