Abstract
Reciprocal pathways are presumedly the dominant wiring organization for cortico-cortical long range projections5. This paper examines the hypothesis that synaptic modification and activation flow in a reciprocal cortico-cortical pathway correspond to learning and retrieval in a bidirectional associative memory (BAM): Unidirectional activation flow may provide the fast estimation of stored information, whereas bidirectional activation flow might establish an improved recall mode. The idea is tested in a network of binary neurons where pairs of sparse memory patterns have been stored in bidirectional synapses by fast Hebbian learning (Willshaw model). We assume that cortical long-range connections shall be efficiently used, i.e., in many different hetero- associative projections corresponding in technical terms to a high memory load. While the straight-forward BAM extension of the Willshaw model does not improve the performance at high memory load, a new bidirectional recall method (CB-retrieval) is proposed accessing patterns with highly improved fault tolerance and also allowing segmentation of ambiguous input. The improved performance is demonstrated in simulations. The consequences and predictions of such a cortico-cortical pathway model are discussed. A brief outline of the relations between a theory of modular BAM operation and common ideas about cell assemblies is given.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
D. A. Amit. The Hebbian paradigm reintegrated: Local reverberations as internal representations. Behavioural and Brain Sciences, 18: 617–657, 1995.
A. Bibbig and T. Wennekers. Hippocamal two-stage learning and memory consolidation. In Proceedings of the 13th European Meeting on Cybernetics and Systems Research, 1996.
V. Braitenberg and A. Schiiz. The anatomy of the cortex. Statistics and Geometry. Springer, Berlin Heidelberg New York, 1991.
M. Caesar, D. A. Brown, B. H. Gahwiler, and T. Knopfel. Characterization of a calcium-dependent current generating a slow afterdepolarization of CA3 pyramidal cells in rat hippocampal slice cultures. European Journal of Neuroscience, 5: 560–569, 1993.
D. J. Felleman and D. C. Van Essen. Distributed hierarchical processing in the primate cerebral cortex. Cerebral Cortex, 1: 1–47, 1991.
B. Gustafsson and H. Wigström. Physiological mechanisms underlying long-term potentiation. Trends Neurosci., 11: 156–162, 1988.
D. O. Hebb. The Organization of Behaviour. Wiley, New York, 1949.
J.J. Hopfield. Neural networks and physical systems with emergent collective computational abilities. Proceedings of the National Academy of Sciences, USA, 79, 1982.
O. Jensen and J. E. Lisman. Novel lists 7±2 known items can be reliable stored in an oscillatory short-term memory network: Interaction with long-term memory. Learning & Memory, 3: 257–263, 1996.
B. Kosko. Adaptive bidirectional associative memories. Applied Optics, 26(23): 4947–4971, 1987.
C.-S. Leung, L.-W. Chan, and E. Lai. Stability, capacity and statistical dynamics of second-order bidirectional associative memory. IEEE Trans. Syst, Man Cybern., 25(10): 1414–1424, 1995.
A. Schiiz. Patchiness as a means to get a message across. Trends in Neuroscience, 17(9): 365, 1994.
F. Schwenker, F. T. Sommer, and G. Palm. Iterative retrieval of sparsely coded associative memory patterns. Neural Networks, 9(3): 445–455, 1996.
F. T. Sommer and G. Palm. Improved bidirectional retrieval of sparse patterns stored by Hebbian learning. Submitted to Neural Networks, 1997.
F. T. Sommer and G. Palm. Bidirectional retrieval from associative memory. In Neural Information Processing Systems 10. Lawrence Erlbaum Ass. Inc., 1998.
K. Steinbuch. Die Lernmatrix. Kybernetik, 1: 36–45, 1961.
Y. F. Wang, J. B. Cruz, and J. H. Mulligan. Two coding stragegies for bidirectional associative memory. IEEE Trans. Neural Networks, 1(1): 81–92, 1990.
D. J. Willshaw, O. P. Buneman, and H. C. Longuet-Higgins. Nonholographic associative memory. Nature, 222: 960–962, 1969.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1998 Springer Science+Business Media New York
About this chapter
Cite this chapter
Sommer, F.T., Wennekers, T., Palm, G. (1998). Bidirectional Completion of Cell Assemblies in The Cortex. In: Bower, J.M. (eds) Computational Neuroscience. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4831-7_88
Download citation
DOI: https://doi.org/10.1007/978-1-4615-4831-7_88
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4613-7190-8
Online ISBN: 978-1-4615-4831-7
eBook Packages: Springer Book Archive