Local adaptations of two naturally occurring neuronal conductances, gK+(A) and gK+(Ca), allow for associative conditioning and contiguity judgements in artificial neural networks
✍ Scribed by J. Berner; C. D. Woody
- Book ID
- 104659165
- Publisher
- Springer-Verlag
- Year
- 1991
- Tongue
- English
- Weight
- 771 KB
- Volume
- 66
- Category
- Article
- ISSN
- 0340-1200
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✦ Synopsis
A~tract. Features of two potassium conductances implicated in the acquisition of conditioned reflexes, the slow calcium dependent conductance (gK+(Ca)) and the fast transient conductance (gK+(A)), were incorporated into a 6 x 6 element artificial neural network. Adaptive algorithms derived from observations of cortical neurons during associative learning changed gK+(A) in proportion to the product of this current and an EPSP-induced second messenger concentration, and changed gK + (Ca) as a function of a spike-induced second messenger concentration. This network concurrently acquired two distinct representations in response to presentation of stimuli: one resembled associative conditioning (defined in terms of its senstivity to forward pairing vs. simultaneous or backward pairing); the other reflected contiguous pairings of stimuli. The acquisition of one representation did not markedly interfere with acquisition of the other. This network may accordingly serve as an example of a self-organizing system which minimizes the postulated inherent cross talk between functionally dissiminar representations (Minsky and Papert 1988).