ArticleDepression and anxiety2022
Elucidating behavioral and functional connectivity markers of aberrant threat discrimination in PTSD.
Article in Depression and anxiety, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- Article
- Functional brain imaging in posttraumatic stress disorder: a review.Journal of neural transmission (Vienna, Austria : 1996) · 2026Article
- Psychometric Considerations in Assessing Fear Generalization as a Predictor of Anxiety.Biological psychiatry global open science · 2025Article
- Impact of Post-Traumatic Stress Disorder Duration on Volumetric and Microstructural Parameters of the Hippo-Campus, Amygdala, and Prefrontal Cortex: A Multiparametric Magnetic Resonance Imaging Study with Correlation Analysis.Journal of clinical medicine · 2025Article
- Stress disrupts engram ensembles in lateral amygdala to generalize threat memory in mice.Cell · 2025Article
- Impacts of social isolation stress in safety learning and the structure of defensive behavior during a spatial-based learning task involving thermal threat.Frontiers in behavioral neuroscience · 2024Article
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Authors and funding
9 authors.
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Abstract
backgroundPatients with posttraumatic stress disorder (PTSD) tend to overgeneralize threat to safe stimuli, potentially reflecting aberrant stimuli discrimination. Yet, it is not clear whether threat overgeneralization reflects general discrimination deficits, or rather a specific bias related to aversive stimuli. Here we tested this question and characterized the neural correlates of threat discrimination.
methodsOne-hundred and eight participants (33 PTSD; 43 trauma-exposed controls; 32 healthy controls) completed an emotionally neutral complex shape discrimination task involving identifying in 42 similar pairs the previously observed shape; and an emotionally aversive discrimination task, involving providing risk ratings for an aversive conditioned stimulus (CS+), and for several stimuli gradually differing in size from the original CS+. Resting state functional connectivity (rsFC) was collected before completing the tasks.
resultsNo group differences emerged on the emotionally neutral task. Conversely, on the emotionally aversive task, individuals with PTSD had steeper linear risk rating slopes as the stimuli more resembled the conditioned stimulus. Finally, lower rsFC of amygdala-default mode network (DMN) and DMN-salience network (SN) were associated with steeper risk slopes, while for hippocampus-SN, lower rsFC was found only among participants with PTSD.
conclusionsIndividuals with PTSD show deficits in discrimination only when presented with aversive stimuli. Dysregulated discrimination pattern may relate to a lack of input from regulatory brain areas (e.g., DMN/hippocampus) to threat-related brain areas (e.g., SN/amygdala).
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