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Robert Gütig (Max-Planck Institute for Experimental Medicine, Göttingen, Germany)

"Spike-timing based neuronal information processing: applications to vision and speech" / Tuesday, January 17, 2012, 17:15 h
Wann 17.01.2012
von 17:15 bis 18:45
Wo Lecture Hall, Hansastr. 9a
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The Bernstein Center Freiburg



Bernstein Seminar
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Robert Gütig
Max-Planck Institute for Experimental Medicine
Göttingen, Germany

 
Spike-timing based neuronal information processing: applications to vision and speech

Tuesday, January 17, 2012

17:15 h

Lecture Hall (ground floor)
Bernstein Center Freiburg
Hansastraße 9A
79104 Freiburg

Abstract:
The timing of action potentials of sensory neurons contains substantial information about the eliciting stimuli. Although computational advantages of spike-timing-based neuronal codes have long been recognized, it is unclear whether and how neurons can learn to read out such representations. We propose a novel biologically plausible supervised synaptic learning rule, the tempotron, enabling neurons to efficiently learn a broad range of decision rules, even when information is embedded in the spatio-temporal structure of spike patterns and not in mean firing rates. We demonstrate the enhanced performance of the tempotron over the rate-based perceptron in reading out spike patterns from retinal ganglion cell populations.

Extending the tempotron to conductance-based voltage kinetics, we show that this model can subserve time-warp invariant processing of afferent spike patterns. Furthermore, we show that the conductance-based tempotron can learn to balance excitation and inhibition to match its integration time constant to the temporal scale of a given processing task. These mechanisms enable already small populations of model neurons to match the performance of state-of-the-art speech recognition systems on isolated word recognition tasks.

The talk is open to the public. Guests are cordially invited!
www.bcf.uni-freiburg.de

 

abgelegt unter: Bernstein Seminar