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Neural network realization of sensorimotor space organization using predictability and decorrelation

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Introduction

Different coding principles like stability have been successfully applied to passive sensory stimuli to capture sensory representation of neurons [1]. It has become obvious later that the agent's behavioral repertoire has a crucial impact on the formation of the sensory representation and thus highlights the importance of the sensorimotor space. A heuristic rule-based investigation [2] demonstrates that optimizing the predictability in sensorimotor space of foraging agent leads to the emergence of place fields. The present work implements this principle in a biologically plausible neural-network architecture.

Methods

We use a virtual robot exploring environments with different exploration parameters. Its behavior is captured in a transition matrix, quantifying the probability to receive certain sensory signals as a consequence of previous sensory signals and the chosen behavior. Next, we implemented predictability and decorrelation in a Hebbian framework. After learning, response properties of neurons are quantified and compared to alternative adaptation scheme [2].

Results

Figure 1 represents the initial assumed representation of a circular environment. This was taken from an intermediate stage of the heuristic rule based implementation [2]. Figure 2 obtained after learning on the neural network through 2000 timesteps (actions) by the robot in the environment. The learning leads to compact states that are similar to place fields. The network learns quickly and converges to a stable state.

Figure 1
figure1

Initial assumed representation of a circular environment.

Figure 2
figure2

Sensorimotor representation after 2000 steps of learning.

Discussion

Although predictability appears mathematically complex, it is possible to implement it in a biologically plausible neural network. The performance is as good as the heuristic rule based algorithm in terms of convergence. Therefore, predictability holds the promise to be a general principle in cortical processing.

References

  1. 1.

    Wyss R, König P, Verschure PF: A model of the ventral visual system based on temporal stability and local memory. PLoS Biology. 2006, 4: e120-10.1371/journal.pbio.0040120.

  2. 2.

    Märtin R, Weiller D, Dähne S, Engel AK, König P: Sensory space representations based on motor capabilities. Eighth Göttingen Meeting of the German Neuroscience Society. 2009

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Acknowledgements

The European Commission for the SF project; contract number FP7-ICT-217148-SF.

The authors and contributors of IQR, particularly Ulysses Bernardet, UPF, Barcelona.

Joao Hespanha, for providing Matlab function for graph partitioning. http://www.ece.ucsb.edu/~hespanha.

Author information

Correspondence to Madhusudhana Rao.

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Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Rao, M., Weiller, D., Märtin, R. et al. Neural network realization of sensorimotor space organization using predictability and decorrelation. BMC Neurosci 10, P145 (2009) doi:10.1186/1471-2202-10-S1-P145

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Keywords

  • Sensory Signal
  • Heuristic Rule
  • Place Field
  • Behavioral Repertoire
  • Cortical Processing