Prefrontal Brain Pathway Controls Threat-Memory Specificity in Rats
Published in Brain/Neurology, Journals, Memory.
Published October 20, 2026.
Researchers at the University of Iowa have identified a brain pathway that helps distinguish a threatening context from a safe one. The study, published in Nature Communications on October 20, examined how aversive memories become generalized in male rats.
The team used optogenetics to alter communication from the rostral prelimbic cortex to the anteroventral bed nuclei of the stria terminalis after training. Inhibiting this pathway increased generalization across contexts without changing the measured strength of the memory. Exciting the pathway instead improved contextual discrimination.
Although inhibition also increased the stress hormone corticosterone, memory generalization persisted in rats whose adrenal glands had been removed. This supports a circuit mechanism that does not require adrenal glucocorticoids under these experimental conditions.
Calcium recordings further showed that the pathway responded differently during recall in neutral and aversive settings.
The findings help separate memory specificity from memory strength and stress-hormone effects. They may inform research on stress-related disorders, but the work does not demonstrate a treatment or establish the same mechanism in humans. The peer-reviewed article is available ahead of final editorial changes.
Source: Lingg and colleagues, Nature Communications, October 20, 2026.