Neurology Medical News about multiple-choice decision making;encoding of alternatives

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The encoding of alternatives in multiple-choice decision making
Proceedings of the National Academy of Sciences of the United States of America, 06/29/09

Albantakis L et al. – Results suggest a physiological advantage of a pooled, multineuron representation of choice alternatives.

Methods

Study of methods for different numbers of choice alternatives and encoding in brain
Presentation of a minimal, biophysically realistic spiking neuron model for decision-making with multiple alternatives
Model accounts for relevant aspects of recent experimental data of a random-dot motion-discrimination task on both cellular and behavioral levels
All network parameters and inputs independent of the number of possible alternatives in tested experimental paradigms
Experimental paradigms: 2 and 4 alternatives; 2 alternatives with 90° angular separation

Results

No extra top-down regulation mechanisms necessary to adapt network to number of choices
Increasing number of neurons encoding each choice alternative positively relates to network's capacity of choice-number-independent decision-making

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