Seeing Patterns in Randomness: A Computational Model of Surprise

Topics in Cognitive Science
Phil MaguireMark T Keane

Abstract

While seemingly a ubiquitous cognitive process, the precise definition and function of surprise remains elusive. Surprise is often conceptualized as being related to improbability or to contrasts with higher probability expectations. In contrast to this probabilistic view, we argue that surprising observations are those that undermine an existing model, implying an alternative causal origin. Surprises are not merely improbable events; instead, they indicate a breakdown in the model being used to quantify probability. We suggest that the heuristic people rely on to detect such anomalous events is randomness deficiency. Specifically, people experience surprise when they identify patterns where their model implies there should only be random noise. Using algorithmic information theory, we present a novel computational theory which formalizes this notion of surprise as randomness deficiency. We also present empirical evidence that people respond to randomness deficiency in their environment and use it to adjust their beliefs about the causal origins of events. The connection between this pattern-detection view of surprise and the literature on learning and interestingness is discussed.

References

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Citations

Dec 24, 2018·Topics in Cognitive Science·Edward L MunnichMark T Keane

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