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Tuesday, April 17, 2018

Planning Complexity Registers as a Cost in Metacontrol

Kool, W., Gershman, S. J., & Cushman, F. A. (in press). Planning complexity registers as a
cost in metacontrol. Journal of Cognitive Neuroscience.


Decision-making algorithms face a basic tradeoff between accuracy and effort (i.e., computational demands). It is widely agreed that humans have can choose between multiple decision-making processes that embody different solutions to this tradeoff: Some are computationally cheap but inaccurate, while others are computationally expensive but accurate. Recent progress in understanding this tradeoff has been catalyzed by formalizing it in terms of model-free (i.e., habitual) versus model-based (i.e., planning) approaches to reinforcement learning. Intuitively, if two tasks offer the same rewards for accuracy but one of them is much more demanding, we might expect people to rely on habit more in the difficult task: Devoting significant computation to achieve slight marginal accuracy gains wouldn’t be “worth it”. We test and verify this prediction in a sequential RL task. Because our paradigm is amenable to formal analysis, it contributes to the development of a computational model of how people balance the costs and benefits of different decision-making processes in a task-specific manner; in other words, how we decide when hard thinking is worth it.

The research is here.