1. What is the effect of prediction-error observations on informational surprise?
Free energy—an upper bound on entropy—is minimized by means of prediction-error observations, with the effect of minimizing informational surprise within the bounds of feasibility.
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2. What is the main reason why the brain is a hierarchy of generative models?
Bayesian probability theory has long been the framework of choice for work which views the brain as a hierarchy of generative models.
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3. What is the key function of the hierarchical prediction machine?
The machine must be robust and consistent in the way it exploits the patterns of implication that can arise in a hierarchical structure of predictive models.
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4. What is the effect of the proposal on the cognitive system?
Granting that the authors can view actions as predictions put into a behavioral form, the proposal has the effect of unifying interpretive and behavioral functionality (Brown et al., 2011; Friston et al., 2009).
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