Do “Lateral Connections” in the Cortex Carry Out Topological Information?
The observed massive presence of non-local lateral connections in the cerebral cortex is not compatible with the implicit assumption of flatness of most models, including models of associative areas. We suggest a novel hypothesis about the functional role of lateral connections in such areas: they may reflect a topological representations of the task space. In particular, we show how the topologic information, supported by long-range connections in associative areas, can represent spatial or metric knowledge. The power of the mechanism is demonstrated by describing an activation dynamics and showing the formation of bands of ocular dominance.
KeywordsTopological Information Task Space Ocular Dominance Hebbian Learning Lateral Connection
Unable to display preview. Download preview PDF.
- V. Braitenberg. Vehicles - Experiments in Synthetic Psychology. MIT Press, Cambridge, MA, 1984.Google Scholar
- F. Frisone, F. Firenze, P. Morasso, and L. Ricciardiello. Application of Topology-Representing Networks to the Estimation of the Intrinsic Dimensionality of Data. In ICANN95- Int. Conf on Artificial Neural Networks, volume 1, pages 323–327, Paris, October 1995.Google Scholar
- G. J. Mitchison. Neuronal branching patterns and the economy of cortical wiring. Proc. of the Royal Society, B: 151–158, 1991.Google Scholar
- P. Morasso and V. Sanguineti. Self-organizing body-schema for motor planning. Journal of Motor Behavior, 26: 131–148, 1995.Google Scholar
- V. Sanguineti, R. Morasso, and F. Frisone. Cortical maps of sensorimotor spaces. In P. Morasso and V. Sanguineti, editors, Self-organization, Computational Maps, and Motor Control,pages 1–36. Elsevier Science Publishers, Amsterdam, 1997. in press.Google Scholar
- D. M. Wolpert, Z. Ghahramani, and M. I. Jordan. Are arm trajectories planned in kinematic or dynamic coordinates? an adaptation study. Experimental Brain Research,1995. in press.Google Scholar