Second order conditioning in the sub-cortical nuclei of the limbic system

Thompson, A.M., Porr, B. , Kolodziejski, C. and Worgotter, F. (2008) Second order conditioning in the sub-cortical nuclei of the limbic system. In: Asada, M., Hallam, J.C.T., Meyer, J.A. and Tani, J. (eds.) From Animals to Animats 10, Proceedings. Series: Lecture notes in computer science: Lecture notes in artificial intelligence (5040). Springer-Verlag: Berlin, pp. 189-198. ISBN 9783540691334

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Three factor Isotropic sequence order (ISO3) learning is a form of differential Hebbian learning where a third factor switches on learning at relevant moments for example, after reward retreival. This switch enables learning only at specific moments and, thus, stablises the corresponding weights. The concept of using a third factor as a gating signal for learning at relevant moments has been extended in this paper to perform second order conditioning (SOC). We present a biological model of the sub-cortical nuclei of the limbic system that is capable of performing SOC in a food seeking task. The 3rd-factor is modelled by dopaminergic neurons of the VTA which are activated via a direct excitatory glutamatergic pathway, and an indirect dis-inhibitory CABAergic pathway. The latter generates an amplification in the number of tonically active DA neurons. This produces an increase in DA outside the event of a primary reward and enables SOC to be accomplished

Item Type:Book Sections
Additional Information:10th International Conference on Simulation of Adaptive Behavior, Osaka, JAPAN, JUL 07-12, 2008 Series ISSN: 0302-9743
Glasgow Author(s) Enlighten ID:Porr, Dr Bernd
Authors: Thompson, A.M., Porr, B., Kolodziejski, C., and Worgotter, F.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:From Animals to Animats 10, Proceedings

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