Neural Darwinism: The Theory of Neuronal Group Selection

By Gerald M. Edelman | Go to book overview

7
Synapses as Populations:
The Bases of the
Secondary Repertoire

Epigenetic nature of synaptic modification 180 · Synapses as populations 181 · Independence of pre- and postsynaptic changes 181 · The importance of heterosynaptic change 181 · The dual rules model 183 · Formal postsynaptic rule 183 · Computer simulation of neuronal group selection via the postsynaptic rule in a model of somatosensory cortex 188 · Formal presynaptic rule 192 · Interaction of the two rules 195 Advantage of neuronal group structure for rule interaction 196 · Computer simulations 198 · Transmitter logic: advantages of multiple transmitters 203 · Synaptic change and the stability of memory: short- and long-term effects 204


INTRODUCTION

In the beginning of the present part, I described a series of epigenetic mechanisms to account for the formation of the primary repertoire. As expressed in the regulator hypothesis, the basic mechanisms were concerned with the developmental origins of variability and constancy in the connectivity of neural networks. We may now turn to a detailed discussion of the second set of pivotal epigenetic mechanisms fundamental for the theory: those concerned with synaptic change as the

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