Associability-modulated loss learning is increased in posttraumatic stress disorder

Vanessa M. Brown, Lusha Zhu, John M. Wang, B. Christopher Frueh, Brooks King-Casas, Pearl H. Chiu

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Disproportionate reactions to unexpected stimuli in the environment are a cardinal symptom of posttraumatic stress disorder (PTSD). Here, we test whether these heightened responses are associated with disruptions in distinct components of reinforcement learning. Specifically, using functional neuroimaging, a loss-learning task, and a computational model-based approach, we assessed the mechanistic hypothesis that overreactions to stimuli in PTSD arise from anomalous gating of attention during learning (i.e., associability). Behavioral choices of combat-deployed veterans with and without PTSD were fit to a reinforcement learning model, generating trial-by-trial prediction errors (signaling unexpected outcomes) and associability values (signaling attention allocation to the unexpected outcomes). Neural substrates of associability value and behavioral parameter estimates of associability updating, but not prediction error, increased with PTSD during loss learning. Moreover, the interaction of PTSD severity with neural markers of associability value predicted behavioral choices. These results indicate that increased attention-based learning may underlie aspects of PTSD and suggest potential neuromechanistic treatment targets.

Original languageEnglish (US)
Article numbere30150
JournaleLife
Volume7
DOIs
StatePublished - Jan 9 2018

ASJC Scopus subject areas

  • Neuroscience(all)
  • Immunology and Microbiology(all)
  • Biochemistry, Genetics and Molecular Biology(all)

Fingerprint Dive into the research topics of 'Associability-modulated loss learning is increased in posttraumatic stress disorder'. Together they form a unique fingerprint.

Cite this