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• W3214081781 abstract "Abstract Surprising events trigger measurable brain activity and influence human behavior by affecting learning, memory, and decision-making. Currently there is, however, no consensus on the definition of surprise. Here we identify 16 mathematical definitions of surprise in a unifying framework, show how these definitions relate to each other, and prove under what conditions they are indistinguishable. We classify these surprise measures into four main categories: (i) change-point detection surprise, (ii) information gain surprise, (iii) prediction surprise, and (iv) confidence-correction surprise. We design experimental paradigms where different categories make different predictions: we show that surprise-modulation of the speed of learning leads to sensible adaptive behavior only for change-point detection surprise whereas surprise-seeking leads to sensible exploration strategies only for information gain surprise. However, since neither change-point detection surprise nor information gain surprise perfectly reflect the definition of ‘surprise’ in natural language, a combination of prediction surprise and confidence-correction surprise is needed to capture intuitive aspects of surprise perception. We formalize this combination in a new definition of surprise with testable experimental predictions. We conclude that there cannot be a single surprise measure with all functions and properties previously attributed to surprise. Consequently, we postulate that multiple neural mechanisms exist to detect and signal different aspects of surprise. Author note AM is grateful to Vasiliki Liakoni, Martin Barry, and Valentin Schmutz for many useful discussions in the course of the last few years, and to Andrew Barto for insightful discussions through and after EPFL Neuro Symposium 2021 on “Surprise, Curiosity and Reward: from Neuroscience to AI”. We thank K. Robbins and collaborators for their publicly available experimental data (Robbins et al., 2018). All code needed to reproduce the results reported here will be made publicly available after publication acceptance. This research was supported by Swiss National Science Foundation (no. 200020_184615). Correspondence concerning this article should be addressed to Alireza Modirshanechi, School of Computer and Communication Sciences and School of Life Sciences, EPFL, Lausanne, Switzerland. E-mail: alireza.modirshanechi@epfl.ch ." @default.
• W3214081781 created "2021-11-22" @default.
• W3214081781 creator A5003480477 @default.
• W3214081781 creator A5006129821 @default.
• W3214081781 creator A5036061801 @default.
• W3214081781 date "2021-11-04" @default.
• W3214081781 modified "2023-09-30" @default.
• W3214081781 title "Surprise: a unified theory and experimental predictions" @default.
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• W3214081781 doi "https://doi.org/10.1101/2021.11.01.466796" @default.
• W3214081781 hasPublicationYear "2021" @default.
• W3214081781 type Work @default.

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