Gain modulation of actions selection without synaptic relearning
Résumé
Adaptation of behavior to a changing environment requires the brain to change the probability of selecting actions based on their reward or punishment. The present study proposes a simple neural mechanism of gain modulation that makes possible rapid changes in the probability of selecting actions after different levels of negative feedback. The effects of gain modulation on action selection are studied in a network of neuronal populations of excitatory neurons regulated by inhibition. Results show that neuronal gain can embed memories of past experiences without modification of synaptic efficacies, in complement to synaptic plasticity.
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