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Nat Hum Behav. 2018 Apr;2(4):291-299. doi: 10.1038/s41562-018-0317-4. Epub 2018 Mar 5.

Event segmentation protects emotional memories from competing experiences encoded close in time.

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Department of Psychiatry, University of Texas at Austin, Austin, Texas, USA.
Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Centre, Nijmegen, The Netherlands.
Department of Psychology, New York University, New York, New York, USA.
Department of Psychology, Columbia University, New York, New York, USA.
Center for Neural Science, New York University, New York, New York, USA.
Nathan Kline Institute, Orangeburg, New York, USA.


Fear memories are characterized by their permanence and a fierce resistance to unlearning by new experiences. We considered whether this durability involves a process of memory segmentation that separates competing experiences. To address this question, we used an emotional learning task designed to measure recognition memory for category exemplars encoded during competing experiences of fear-conditioning and extinction. Here we show that people recognized more fear-conditioned exemplars encoded during conditioning than conceptually related exemplars encoded immediately after a perceptual event boundary separating conditioning from extinction. Selective episodic memory depended on a period of consolidation, an explicit break between competing experiences, and was unrelated to within-session arousal or the explicit realization of a transition from conditioning to extinction. Collectively, these findings suggest that event boundaries guide selective consolidation to prioritize emotional information in memory-at the expense of related but conflicting information experienced shortly thereafter. We put forward a model whereby event boundaries bifurcate related memory traces for incompatible experiences. This stands in contrast to a mechanism that integrates related experiences for adaptive generalization123, and reveals a potentially distinct organization by which competing memories are adaptively segmented to select and protect nascent fear memories from immediate sources of interference.

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