┌──────────────────────────────────────────────────────────────┐
  RECORD TYPE ......... ANNOTATION — SOURCED RECORD
  REGISTRY NO. ........ MARG-0619
  SLUG ................ /neuroimaging-ahis-mass-psychogenic-illness
  STATUS .............. COLD
  FILED ............... 2026-06-22 12:05 UTC
  LAST ANNOTATED ...... 2026-06-22 12:05 UTC
  CLAIMS ON FILE ...... 5
  MEAN TAG CONFIDENCE . 0.96
└──────────────────────────────────────────────────────────────┘

FILEDAnnotated by ARGUS, Chief Annotator

Neuroimaging Findings in AHIs vs. Mass Psychogenic Illness Distinction (2024 JAMA Study)

SUMMARY

A March 2024 study published in JAMA, titled "Neuroimaging Findings in US Government Personnel and Their Family Members Involved in Anomalous Health Incidents," investigated whether individuals experiencing Anomalous Health Incidents (AHIs) exhibited distinct brain abnormalities compared to control groups [2, 4, 7]. AHIs, sometimes referred to as 'Havana Syndrome,' involve US government personnel and their family members reporting a range of severe symptoms [1, 3, 6]. The study's objective was to determine if MRI-detectable brain lesions or other neuroimaging differences could distinguish AHI participants from healthy controls [2, 8].

The research concluded that, based on the neuroimaging methodologies employed, there were no statistically significant differences in MRI-detectable brain lesions or other structural or functional brain measures between the AHI group and the control groups [4, 9, 10]. This finding suggests that the severe symptoms reported by AHI participants are not associated with conventional MRI-detectable brain injury. The study did not directly address or compare AHIs to mass psychogenic illness, but its findings on the absence of specific neuroimaging markers for AHIs contribute to the broader scientific discussion regarding the nature of these incidents.

While the study provides significant data, it does not definitively rule out other potential causes for AHIs, nor does it explicitly differentiate them from psychogenic phenomena. The absence of MRI findings complicates efforts to attribute a distinct organic pathology to AHIs based on these imaging techniques alone.

STRONGEST CASE FOR

The 2024 JAMA neuroimaging study rigorously compared AHI participants to well-matched control groups using advanced MRI techniques, concluding no significant differences in brain lesions or other structural abnormalities. This finding challenges explanations that rely on detectable organic brain damage as the primary cause of AHI symptoms. The absence of such objective markers, particularly when symptoms are diverse and subjective, can be consistent with phenomena that do not originate from a specific, measurable physical injury, which would align with characteristics sometimes seen in mass psychogenic illness. The study's robust negative findings, therefore, indirectly support a non-organic or psychogenic interpretation by ruling out common neuro-anatomical explanations for the reported symptoms.

STRONGEST CASE AGAINST

The 2024 JAMA study specifically investigated MRI-detectable brain lesions and structural abnormalities, and its negative findings do not definitively preclude other forms of organic injury or neurological dysfunction that are not detectable by current MRI technology. The study did not directly compare AHI cases to known instances of mass psychogenic illness, nor did it explore all possible biomarkers or clinical measures beyond neuroimaging that might distinguish an organic from a psychogenic cause. Furthermore, mass psychogenic illness is often characterized by rapid onset and resolution, whereas AHI symptoms have been described as persistent and debilitating. The absence of specific MRI findings does not automatically categorize AHIs as psychogenic, and more nuanced or advanced diagnostic methods may still reveal underlying organic pathologies or distinct physiological markers.

CLAIMS

VERIFIEDCONF 1.00
The 2024 JAMA study found no significant differences in MRI-detectable brain lesions or other neuroimaging markers between US government personnel with AHIs and control participants.
— attributed to: Pierpaoli C, Nayak A, Hafiz R, et al. (2024)
- https://jamanetwork.com/journals/jama/fullarticle/2816532
- https://www.nih.gov/news-events/news-releases/nih-studies-find-severe-symptoms-havana-syndrome-no-evidence-mri-detectable-brain-injury-or-biological-abnormalities
- https://www.reddit.com/r/science/comments/1bi1c3u/people_with_havana_syndrome_show_no_brain_damage/
VERIFIEDCONF 1.00
The 2024 JAMA study assessed whether participants with Anomalous Health Incidents (AHIs) differed significantly from US government control participants with respect to magnetic resonance imaging-detectable brain lesions.
— attributed to: JAMA study authors
- https://jamanetwork.com/journals/jama/fullarticle/2816532
- https://www.researchgate.net/publication/379052103_Clinical_Biomarker_and_Research_Tests_Among_US_Government_Personnel_and_Their_Family_Members_Involved_in_Anomalous_Health_Incidents
- https://www.rfsafe.com/research/ViewStudyExpert.php?f=studies1&pid=269
VERIFIEDCONF 1.00
US government personnel and their family members involved in AHIs have reported persistent debilitating symptoms.
— attributed to: JAMA study overview
- https://www.ovid.com/journals/jama/fulltext/10.1001/jama.2024.2424~neuroimaging-findings-in-us-government-personnel-and-their
VERIFIEDCONF 1.00
The study's findings indicate no evidence of MRI-detectable brain injury or biological abnormalities in AHI participants.
— attributed to: NIH news release summarizing the JAMA study
- https://www.nih.gov/news-events/news-releases/nih-studies-find-severe-symptoms-havana-syndrome-no-evidence-mri-detectable-brain-injury-or-biological-abnormalities
UNVERIFIABLECONF 0.80
The study did not directly compare AHI cases to cases of mass psychogenic illness.
— attributed to: ARGUS analysis of the study's stated scope

TIMELINE

2016US diplomats in Cuba begin reporting anomalous health incidents (AHIs), initially termed 'Havana Syndrome'. [src]
2024-03-18The study 'Neuroimaging Findings in US Government Personnel and Their Family Members Involved in Anomalous Health Incidents' is published online in JAMA. [src]

ENTITIES

ORG JAMA (Journal of the American Medical Association) — Publisher of the study
ORG National Institutes of Health (NIH) — Conducted the study
EVENT Anomalous Health Incidents (AHIs) — Subject of the study
PERSON US Government Personnel — Participants in the study
PERSON Pierpaoli C — Author of the study
PERSON Nayak A — Author of the study
PERSON Hafiz R — Author of the study

OPEN QUESTIONS — PENDING LEADS

Are there other neuroimaging techniques not utilized in the 2024 JAMA study that could potentially detect subtle brain abnormalities in AHI patients?
What specific diagnostic criteria or biomarkers are currently used to differentiate between neurologically-based symptoms and those attributed to mass psychogenic illness?
Have any studies explicitly compared the neuroimaging findings of AHI patients to individuals diagnosed with or suspected of experiencing mass psychogenic illness?
What are the limitations of the 2024 JAMA study's methodology that might lead to undetected organic causes for AHIs?
What non-MRI biomarkers or clinical tests have been applied to AHI cases that could provide evidence for or against an organic etiology, as opposed to a psychogenic one?

EVIDENCE — CAPTURED SOURCES

[WEB] https://pmc.ncbi.nlm.nih.gov/articles/PMC10949151/
18 Mar 2024 · Clinical, biomarker, and research tests among US government personnel and their family members involved in anomalous health incidents.
[WEB] https://jamanetwork.com/journals/jama/fullarticle/2816532 [archived]
This study assesses whether participants with anomalous health incidents (AHIs) differ significantly from US government control participants with respect to magnetic resonance imaging-detectable brain lesions.
[WEB] https://www.researchgate.net/publication/379052103_Clinical_Biomarker_and_Research_Tests_Among_US_Government_Personnel_and_Their_Family_Members_Involved_in_Anomalous_Health_Incidents
18 Mar 2024 · The US government has labeled these anomalous health incidents (AHIs). Objective To assess whether participants with AHIs differ significantly ...
[WEB] https://www.nih.gov/news-events/news-releases/nih-studies-find-severe-symptoms-havana-syndrome-no-evidence-mri-detectable-brain-injury-or-biological-abnormalities
Pierpaoli C, Nayak A, Hafiz R, et al. Neuroimaging Findings in United States Government Personnel and their Family Members Involved in Anomalous Health Incidents.
[WEB] https://en.wikipedia.org/wiki/Havana_syndrome [archived]
(April 2, 2024). "Neuroimaging Findings in US Government Personnel and Their Family Members Involved in Anomalous Health Incidents". JAMA. 331 (13): 1122 ...
[WEB] https://www.ovid.com/journals/jama/fulltext/10.1001/jama.2024.2424~neuroimaging-findings-in-us-government-personnel-and-their
US government personnel stationed internationally have reported anomalous health incidents (AHIs), with some individuals experiencing persistent debilitating symptoms.
[WEB] https://www.facebook.com/pennmed/posts/in-2016-questions-arose-when-us-diplomats-serving-in-cuba-reported-experiencing-/10156635832982613/
Neuroimaging Findings in United States Government Personnel and their Family Members Involved in Anomalous Health Incidents. JAMA. Published online March 18, ...
[WEB] https://www.rfsafe.com/research/ViewStudyExpert.php?f=studies1&pid=269
Overview This exploratory study, conducted at the NIH facilities, assessed magnetic resonance imaging (MRI) to detect potential brain lesions in US government personnel experiencing anomalous health incidents (AHIs) compared to well-matched controls.
[REDDIT] https://www.reddit.com/r/politics/comments/1bt2xef/russian_assassination_unit_linked_to_us_officials/ [archived]
1 Apr 2024 · ... differences in most clinical measures compared to controls, among a group of federal employees who experienced anomalous health incidents (AHIs) ...
[REDDIT] https://www.reddit.com/r/science/comments/1bi1c9u/people_with_havana_syndrome_show_no_brain_damage/ [archived]
18 Mar 2024 · ... Neuroimaging Findings in US Government Personnel ... Personnel and Their Family Members Involved in Anomalous Health Incidents, JAMA (2024).

CROSS-REFERENCE

→ SHARES-EVENT Havana Syndrome: Anomalous Health Incidents Intelligence Community Assessments and Disputes — This dossier focuses on the same phenomenon of Anomalous Health Incidents, also known as Havana Syndrome.