Abstract
Generalization, the process of applying knowledge acquired in one context to other contexts, often drives the expression of similar behaviors in related situations. At the cellular level, generalization is thought to depend on the activity of overlapping neurons that represent shared features between contexts (general representations). Using contextual fear conditioning in mice, we demonstrate that generalization can also occur in response to stress and result from reactivation of specific, rather than general context representations. We found that generalization emerges during memory retrieval, along with stress-induced abnormalities of septohippocampal oscillatory activity and acetylcholine release, which are typically found in negative affective states. In hippocampal neurons that represent aversive memories and drive generalization, cholinergic septohippocampal afferents contributed to a unique reactivation pattern of cFos, Npas4, and repressor element-1 silencing transcription factor (REST). Together, these findings suggest that generalization can be triggered by perceptually dissimilar but valence-congruent memories of specific aversive experiences. Through promoting the reactivation of such memories and their interference with ongoing behavior, abnormal cholinergic signaling could underlie maladaptive cognitive and behavioral generalization linked to negative affective states.
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Data availability
The data that support the findings of this study and the analysis code are available from the authors on reasonable request.
Change history
09 June 2022
A Correction to this paper has been published: https://doi.org/10.1038/s41380-022-01650-3
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Acknowledgements
We thank Gail Mandel (Oregon Health & Science University) for providing the REST antibody, Ryan Drenan (Wake Forest School of Medicine) for providing advice with behavioral analyses of Chat-Cre mice, John A. Kessler (Northwestern University) for helping us finalize the immunohistochemistry studies in his lab, and Gordon Shepherd (Northwestern University) for discussions and feedback on the circuit approaches.
Author contributions
LYR performed the behavioral, chemogenetic, and RAM experiments and data analysis and helped writing the manuscript. AC performed the optogenetic and fiber photometry experiments and analyzed the data, HZ performed the LFP experiments and data analyses, MAAM helped with the behavioral experiments and histochemical analyses, PG helped with the virus injection and expression analyses, ZP performed the circuit manipulations and RAM/REST studies, XS and YL provided all of the RAM constructs and shared key expertise in experimental design with RAM manipulations, JR designed the overall study, helped with data analysis, and wrote the manuscript.
Funding
This work was funded by NIMH grants MH078064 and MH108837 and Lundbeck Foundation grant R310-2018-3611 to JR, F30MH122130, and T32MH067564 to LR, and NS115543 to YL.
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All animal procedures used in this study were approved by the Northwestern University IACUC and Albert Einstein Medical College IACUC and complied with federal regulations set forth by the National Institutes of Health.
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Ren, L.Y., Cicvaric, A., Zhang, H. et al. Stress-induced changes of the cholinergic circuitry promote retrieval-based generalization of aversive memories. Mol Psychiatry 27, 3795–3805 (2022). https://doi.org/10.1038/s41380-022-01610-x
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DOI: https://doi.org/10.1038/s41380-022-01610-x