Nonlinear predictive coding in early sensory circuits
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1
Janelia Farm Research Campus, Howard Hughes Medical Institute, United States
Early sensory systems, such as retina and olfactory bulb, face a challenge of quickly and accurately transmitting information about the world to higher brain areas through a limited bandwidth channel (“Barlow’s bottleneck”). This can be addressed by a strategy, known as predictive coding, whereby predictable components are subtracted away from incoming stimuli and only the difference is transmitted. Indeed, it was proposed that a linearly computed prediction is subtracted by retinal interneurons (Srinivasan et al. 1982). Here, we advance the predictive coding view by solving the non-linear dynamics of a simplified model of early sensory networks. We demonstrate that due to their non-linearity inhibitory interneurons afford a representation that develops over time from highly sparse and more robust, to less sparse and more accurate. These representations are not transmitted directly to higher brain areas (due to the large number of axons this would require) but are subtracted from the sensory signal in projection neurons to generate the residual. We demonstrate that the transmission of the residual by the projection neurons indeed ameliorates the bandwidth limitation. The proposed neural circuit implementation of the predictor module using sparse representations in inhibitory interneurons solidifies predictive coding as a conceptual framework of early sensory processing.
References
Srinivasan, M.V., Laughlin, S.B., and Dubs, A. (1982). Predictive coding: a fresh view of inhibition in the retina. In Proc R Soc Lond, B, Biol Sci, pp. 427-459.
Keywords:
efficient coding,
network dynamics,
Neural coding,
regularization,
sensory representation
Conference:
Bernstein Conference 2012, Munich, Germany, 12 Sep - 14 Sep, 2012.
Presentation Type:
Poster
Topic:
Abstracts
Citation:
Druckmann
S,
Hu
T and
Chklovskii
D
(2012). Nonlinear predictive coding in early sensory circuits.
Front. Comput. Neurosci.
Conference Abstract:
Bernstein Conference 2012.
doi: 10.3389/conf.fncom.2012.55.00076
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Received:
22 May 2012;
Published Online:
12 Sep 2012.
*
Correspondence:
Dr. Shaul Druckmann, Janelia Farm Research Campus, Howard Hughes Medical Institute, Ashburn, 20147, United States, drucks@lobster.ls.huji.ac.il