Neuronal Predictions of Sparse Linear Representations

Pearlmutter, Barak A. and Asari, Hiroki and Zador, Anthony M. (2005) Neuronal Predictions of Sparse Linear Representations. In: Forum Acusticum, 2005, Budapest.

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A striking feature of many sensory processing problems is that there appear to be many more neurons engaged in the internal representations of the signal than in its transduction. For example, humans have about 30,000 cochlear neurons, but at least a thousand times as many neurons in the auditory cortex. Such apparently redundant internal representations have sometimes been proposed as necessary to overcome neuronal noise. We instead posit that they directly subserve computations of interest. We first review how sparse overcomplete linear representations can be used for source separation, using a particularly difficult case, the HRTF cue (the differential filtering imposed on a source by its path from its origin to the cochlea) as an example. We then explore some robust and generic predictions about neuronal representations that follow from taking sparse linear representations as a model of neuronal sensory processing.

Item Type: Conference or Workshop Item (Paper)
Keywords: Neuronal Predictions; Sparse Linear Representations;
Academic Unit: Faculty of Science and Engineering > Research Institutes > Hamilton Institute
Item ID: 1987
Depositing User: Barak Pearlmutter
Date Deposited: 15 Jun 2010 15:49
Refereed: Yes

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