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Normalization is a general neural mechanism for context-dependent decision making.

Kenway Louie¹, Mel W Khaw, Paul W Glimcher

¹Center for Neural Science, New York University, New York, NY 10003, USA. klouie@cns.nyu.edu

Proceedings of the National Academy of Sciences of the United States of America

|March 27, 2013

Summary

Neural divisive normalization, a brain computation, influences decision-making. This study reveals how normalization in value signals leads to context-dependent choices in humans and monkeys, impacting rational decision-making.

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Area of Science:

Neuroscience
Computational Neuroscience
Decision Science

Background:

Divisive normalization is a key neural computation in sensory systems, involved in contrast adaptation and attention.
Recent research suggests a similar normalization process operates on value signals guiding decision-making.
The impact of this neural normalization on actual choice behavior remains largely unexplored.

Purpose of the Study:

To investigate the effects of neural normalization on choice behavior.
To determine if normalization models can explain context-dependent choice phenomena.
To link neural mechanisms of value coding to observable decision-making patterns.

Main Methods:

Developed choice models incorporating divisive normalization.
Conducted value-guided choice experiments with both human and monkey participants.
Analyzed choice data to identify behaviors consistent with normalization predictions.

Main Results:

Choice models with normalization accurately predicted significant, context-dependent choice phenomena.
Observed behaviors in both humans and monkeys align with normalization-driven predictions.
Normalization effects were evident based on the value and number of alternative options.

Conclusions:

Neural normalization of value signals critically influences stochastic choice behavior.
Normalization provides a quantitative framework for understanding context effects in decision-making.
Findings bridge neural computation and behavioral economics, linking brain mechanisms to choice outcomes.