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QUESTION-303: After cued traumatic recall, do people with persistent PTSD sample disambiguating peripheral context less than matched trauma-exposed controls, and does restoring that sampling during the same exposure produce lasting change that the exposure alone does not?

2 min read

Properties5
StatusOpen
Tagspsychopathology-and-treatment, neuroscience
Linewill-organization
RefinesQUESTION-045 — Is a mental disorder that outlasts its trigger a protective lock-in at the individual scale, a regime kept stable by behaviour that blocks its own disconfirmation while the capacity to leave it degrades, and does cutting the maintaining link, with the regime's content held fixed, produce lasting change?
Cited as “bears on” byTHEORY-1179 — In an active-inference model of post-traumatic context inference, an overly precise prior that one is in a harmful context makes exploratory sampling look uninformative, so the agent attenuates the periphery, never receives the evidence that would correct the prior, and the belief sustains itself; lowering precision removes the symptoms without correcting the prior, THEORY-285 — In an illustrative active-inference simulation of post-traumatic context inference, run once per phenotype, a prior that one is in a harmful context, made overly precise by a run of harmful trials under the "vulnerable" learning and forgetting weights, makes exploratory sampling look uninformative, so the agent attenuates the periphery, never receives the evidence that would correct the prior, and the belief sustains itself; lowering precision makes the attenuation policy less vigorous without correcting the prior, and the policy returns when precision is restored

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Why it is a question

THEORY-285 shows, in illustrative simulation, how an overly precise prior that one is in a harmful context can keep itself up by making exploratory sampling look uninformative. The paper fits no data. Whether people with persistent PTSD do this is open, and it is what QUESTION-045’s lock-in reading of disorder would need at the individual scale.

One reading in the record leans against the sampling account in people, on a different task. In De Kleine et al. (THEORY-912), patients with OCD or PTSD “sampled as often as controls and drew less from the outcomes”. That task is avoiding a safety cue, not sampling context, so it does not answer this question.

What would answer it

Evidence from people, not from the model. Either of two kinds would support it. First, the authors’ own prediction confirmed: after cued traumatic recall, people with PTSD attenuate peripheral evidence about context more than focal evidence, against matched trauma-exposed controls, with context-sampling measured directly (for example by eye movements toward disambiguating periphery). Second, an intervention contrast matched on exposure: restoring context sampling during the same exposure produces lasting change that the same exposure without it does not, while a precision-lowering drug reduces symptoms that return on withdrawal. The account is refuted if people with persistent PTSD sample disambiguating context as much as resilient controls and still keep the harmful-context belief. More simulations with other parameters cannot settle it, and nor can symptom improvement alone.

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