Abstract
Switching between exploratory and defensive behaviour is fundamental to survival of many animals, but how this transition is achieved by specific neuronal circuits is not known. Here, using the converse behavioural states of fear extinction and its context-dependent renewal as a model in mice, we show that bi-directional transitions between states of high and low fear are triggered by a rapid switch in the balance of activity between two distinct populations of basal amygdala neurons. These two populations are integrated into discrete neuronal circuits differentially connected with the hippocampus and the medial prefrontal cortex. Targeted and reversible neuronal inactivation of the basal amygdala prevents behavioural changes without affecting memory or expression of behaviour. Our findings indicate that switching between distinct behavioural states can be triggered by selective activation of specific neuronal circuits integrating sensory and contextual information. These observations provide a new framework for understanding context-dependent changes of fear behaviour.
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Acknowledgements
We thank R. Friedrich, A. Matus and all members of the Lüthi laboratory for discussions and critical comments on the manuscript and E. Oakeley and M. Stadler for advice on statistical analysis and programming. This work was supported by the Austrian Science Fund (FWF), the Novartis Institutes for Biomedical Research, and the Novartis Research Foundation.
Author Contributions C.H., S.C., V.S., L.D. and C.M. performed the experiments and analysed the data. C.H., S.C. and A.L. designed the experiments and wrote the paper.
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Herry, C., Ciocchi, S., Senn, V. et al. Switching on and off fear by distinct neuronal circuits. Nature 454, 600–606 (2008). https://doi.org/10.1038/nature07166
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DOI: https://doi.org/10.1038/nature07166
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