Hipp, Joerg and Einhäuser, Wolfgang and Conradt, Jörg and König, Peter (2005) Learning of somatosensory representations for texture discrimination using a temporal coherence principle. Network: Computation in Neural Systems, 16 (2-3). pp. 223-238. ISSN 0954-898X. http://resolver.caltech.edu/CaltechAUTHORS:20130816-103147278
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In order to perform appropriate actions, animals need to quickly and reliably classify their sensory input. How can representations suitable for classification be acquired from statistical properties of the animal’s natural environment? Akin to behavioural studies in rats, we investigate this question using texture discrimination by the vibrissae system as a model. To account for the rat’s active sensing behaviour, we record whisker movements in a hardware model. Based on these signals, we determine the response of primary neurons, modelled as spatio-temporal filters. Using their output, we train a second layer of neurons to optimise a temporal coherence objective function. The performance in classifying textures using a single cell strongly correlates with the cell’s temporal coherence; hence output cells outperform primary cells. Using a simple, unsupervised classifier, the performance on the output cell population is same as if using a sophisticated supervised classifier on the primary cells. Our results demonstrate that the optimisation of temporal coherence yields a representation that facilitates subsequent classification by selectively conveying relevant information.
|Additional Information:||c2005 Taylor & Francis. Network: Computation in Neural Systems. June/September 2005; 16(2/3): 223–238. This work was financially supported by the EU/BBW “AMOUSE” project (IST-2000-28127, 01.0208-1), Honda RI Europe and the Swiss National Science Foundation (PK, 31-61415.01; WE, PBEZ2–107367).|
|Group:||Koch Laboratory, KLAB|
|Subject Keywords:||Temporal coherence, somatosensory, whisker, vibrissal, slow feature analysis|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||KLAB Import|
|Deposited On:||12 Jan 2008 01:06|
|Last Modified:||02 Dec 2013 23:33|
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