May 2026 · Monthly report

The month in cognitive neurology

A monthly AI-assisted evidence update for specialists in cognitive neurology and neurodegenerative disorders.

At a glance

Executive summary

View methodology

14 fully assessed articles: 9 Diagnosis·0 Treatment·3 Reviews·2 Others·6 Priority

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6 priority findings were selected for rapid review. This month’s strongest clinical signals concern multimodal biomarker diagnosis of degenerative parkinsonism, risk stratification with plasma p-tau217, emerging blood markers for cerebral amyloid angiopathy, and early recognition of treatable autoimmune rapidly progressive dementia.

Selected by clinical relevance

3 priority findings

01DiagnosisA multimodal biomarker strategy to enhance diagnostic precision in neurodegenerative parkinsonism

Dermal α-synuclein and 4-repeat tau seed amplification assays, combined with serum neurofilament light, improved discrimination among Parkinson’s disease, multiple system atrophy, and progressive supranuclear palsy.

02DiagnosisThe Role of Clinical, Plasma, and Imaging Biomarkers in Assessing Future Dementia Risk in Individuals With Subjective Cognitive Decline

In 469 people with subjective cognitive decline, a model combining cognition, plasma p-tau217, and APOE ε4 predicted progression to Alzheimer dementia with a C-index of 0.91; MRI added little for Alzheimer-specific prediction.

03DiagnosisComparison of [18F]flortaucipir and [18F]MK6240 for the detection of tau pathology in Alzheimer’s disease (HEAD)

Among 682 participants completing both scans, [18F]MK6240 detected more medial temporal and neocortical tau pathology and discriminated Alzheimer-related cognitive impairment more accurately than [18F]flortaucipir.

Evidence library

Assessed Articles

11 of 11 results
DiagnosisOriginal researchParkinson’s diseasePriority

A multimodal biomarker strategy to enhance diagnostic precision in neurodegenerative parkinsonism

Martinez-Valbuena I, et al. · Nature Medicine

Dermal α-synuclein and 4-repeat tau seed amplification assays, combined with serum neurofilament light, improved discrimination among Parkinson’s disease, multiple system atrophy, and progressive supranuclear palsy.

DOI ↗PubMed ↗
DiagnosisOriginal researchAlzheimer’s diseasePriority

The Role of Clinical, Plasma, and Imaging Biomarkers in Assessing Future Dementia Risk in Individuals With Subjective Cognitive Decline

Rivera Sánchez M, et al. · Neurology

In 469 people with subjective cognitive decline, a model combining cognition, plasma p-tau217, and APOE ε4 predicted progression to Alzheimer dementia with a C-index of 0.91; MRI added little for Alzheimer-specific prediction.

DOI ↗PubMed ↗
DiagnosisOriginal researchAlzheimer’s diseasePriority

Comparison of [18F]flortaucipir and [18F]MK6240 for the detection of tau pathology in Alzheimer’s disease (HEAD)

Povala G, et al.; HEAD Study · The Lancet

Among 682 participants completing both scans, [18F]MK6240 detected more medial temporal and neocortical tau pathology and discriminated Alzheimer-related cognitive impairment more accurately than [18F]flortaucipir.

DOI ↗PubMed ↗
DiagnosisOriginal researchCerebral Amyloid AngiopathyPriority

A plasma protein signature for cerebral amyloid angiopathy

Singh A, et al. · Acta Neuropathologica

A five-protein plasma panel combined with demographics identified neuropathologically confirmed cerebral amyloid angiopathy with an AUC of 0.90 in the discovery cohort and showed added value in an independent cohort.

DOI ↗PubMed ↗
DiagnosisOriginal researchOther / differential diagnosisPriority

Autoimmune Encephalitis as Treatment-Responsive Cause of Rapidly Progressive Dementia: A Multicenter Prospective Cohort Study

van Steenhoven RW, et al. · Neurology

Autoimmune encephalitis accounted for 39% of 147 rapidly progressive dementia presentations and was the most frequent treatment-responsive cause; early seizures and specific accompanying syndromes helped identify cases.

DOI ↗PubMed ↗
OthersPrimary prevention cohort studyAll-cause dementiaPriority

Smoking Cessation, Weight Change, and Risk of Dementia: A Prospective Cohort Study

Chen H, et al. · Neurology

Smoking cessation was associated with lower dementia risk and slower cognitive decline over long-term follow-up; substantial post-cessation weight gain appeared to attenuate the association.

DOI ↗PubMed ↗
DiagnosisOriginal researchParkinson’s disease

Diagnostic, Prognostic Value, and Pathological Associations of Levodopa Responsiveness in Parkinson’s Disease, Multiple System Atrophy, and Progressive Supranuclear Palsy

Arca VM, et al. · Annals of Neurology

A sustained long-duration levodopa response distinguished Parkinson’s disease from MSA and PSP with 86.4% sensitivity and 95.8% specificity and was associated with lower dementia risk and better survival in PD.

DOI ↗PubMed ↗
DiagnosisOriginal researchCerebral Amyloid Angiopathy

Cerebral Amyloid Angiopathy and Risk of Dementia in Patients With Cognitive Complaint

Raposo N, et al.; MEMENTO Study Group · Neurology

Probable CAA was common among nondemented memory-clinic patients and was associated with greater dementia risk, although results differed between Boston criteria versions and attenuated after additional adjustment.

DOI ↗PubMed ↗
DiagnosisOriginal researchParkinson’s disease

Predictive value of cerebrospinal fluid Alzheimer’s disease biomarkers and neuropsychological measures for cognitive and motor outcomes in Parkinson’s disease

Scalese A, et al. · Brain Communications

In 78 patients with Parkinson’s disease, CSF amyloid and tau measures showed domain-specific cognitive associations and predicted aspects of cognitive and motor progression over 18–24 months.

DOI ↗PubMed ↗
DiagnosisOriginal researchAlzheimer’s disease

Scalable markers for early cognitive decline: Plasma p-tau217, subjective cognitive concerns, and digital testing

Khorsand B, et al. · Alzheimer’s & Dementia

Plasma p-tau217, subjective cognitive concerns, and computerized cognitive performance independently predicted conversion from normal cognition to measurable impairment over 240 weeks.

DOI ↗PubMed ↗
OthersPrimary prevention trial analysisVascular cognitive impairment

Changes in arterial stiffness under blood pressure control are independently associated with cognitive impairment: The SPRINT trial

Hughes TM, et al. · Alzheimer’s & Dementia

In the SPRINT pulse-wave-velocity substudy, reductions in load-dependent arterial stiffness during intensive blood-pressure control were associated with lower long-term risk of cognitive impairment.

DOI ↗PubMed ↗
Quality control

Search methodology

Journal and date searches were run in Europe PMC/PubMed metadata and checked against publisher records. Records were selected by first publication date. Screening was restricted to human studies with direct relevance to cognition, diagnosis, prevention, treatment, or clinically important differential diagnosis.

Date range1–31 May 2026
Candidate records1127
Eligible articles14
Included populationHuman studies only
Detailed search methodology

Search terms

Condition concepts were combined with the following topic concepts and adapted to the syntax of each source:

Diagnosis: diagnos* OR biomarker* OR neuroimaging OR PET OR MRI OR CSF OR plasma OR genetic* OR criteria OR "differential diagnosis" OR screening

Treatment and prevention: treat* OR therap* OR intervention* OR "clinical trial" OR random* OR pharmacolog* OR non-pharmacolog* OR prevention OR safety OR efficacy

Alzheimer’s disease
"Alzheimer disease" OR Alzheimer*
Cerebral Amyloid Angiopathy
"cerebral amyloid angiopathy" OR CAA
Parkinson’s disease
Parkinson* AND (cognit* OR dementia OR "differential diagnosis")
Dementia with Lewy bodies
"dementia with Lewy bodies" OR DLB OR "Lewy body dementia"
Multiple system atrophy
"multiple system atrophy" OR MSA
Progressive supranuclear palsy
"progressive supranuclear palsy" OR PSP
Corticobasal degeneration
"corticobasal degeneration" OR CBD
Corticobasal syndrome
"corticobasal syndrome" OR CBS
Frontotemporal dementia
"frontotemporal dementia" OR "frontotemporal lobar degeneration" OR FTD OR FTLD OR "behavioural variant frontotemporal" OR "behavioral variant frontotemporal" OR bvFTD
Primary progressive aphasias
"primary progressive aphasia" OR "primary progressive aphasias" OR PPA
Vascular cognitive impairment
"vascular cognitive impairment" OR "vascular cognitive decline" OR "vascular dementia"
Creutzfeldt–Jakob disease (CJD)
"Creutzfeldt-Jakob disease" OR CJD OR "prion disease"
Normal pressure hydrocephalus
"normal pressure hydrocephalus" OR NPH
Limbic-predominant age-related TDP-43 encephalopathy (LATE)
"limbic-predominant age-related TDP-43 encephalopathy" OR "LATE-NC"
Primary age-related tauopathy (PART)
"primary age-related tauopathy" OR PART
Argyrophilic grain disease
"argyrophilic grain disease" OR "argyrophilic grains"
Functional cognitive decline
"functional cognitive decline" OR "functional cognitive disorder" OR FCD

Rare disorders13 conditions

CSF1R-related leukoencephalopathy (ALSP)
"CSF1R-related" OR "adult-onset leukoencephalopathy with axonal spheroids" OR ALSP OR "hereditary diffuse leukoencephalopathy with spheroids" OR HDLS
Adult-onset leukodystrophies
"adult-onset leukodystrophy" OR "adult leukodystrophy" OR leukoencephalopathy OR leukodystrophy OR "white matter disease"
CADASIL and CARASIL
CADASIL OR CARASIL OR "cerebral autosomal dominant arteriopathy" OR "cerebral autosomal recessive arteriopathy" OR NOTCH3
Metachromatic leukodystrophy
"metachromatic leukodystrophy" OR arylsulfatase*
X-linked adrenoleukodystrophy
"adrenoleukodystrophy" OR "adrenomyeloneuropathy" OR ABCD1
Alexander disease
"Alexander disease" OR (GFAP AND (mutation* OR variant*))
Vanishing white matter disease
"vanishing white matter" OR "childhood ataxia with central hypomyelination" OR EIF2B*
Niemann-Pick disease type C
"Niemann-Pick" OR NPC1 OR NPC2 OR miglustat
Adult neuronal ceroid lipofuscinosis (Kufs)
"neuronal ceroid lipofuscinosis" OR "Kufs disease" OR CLN6 OR DNAJC5
Fragile X-associated tremor/ataxia syndrome (FXTAS)
"fragile X-associated tremor" OR FXTAS OR (FMR1 AND premutation)
Cerebrotendinous xanthomatosis
"cerebrotendinous xanthomatosis" OR CYP27A1 OR "chenodeoxycholic acid"
Wilson disease
"Wilson disease" OR "Wilson's disease" OR ATP7B OR ceruloplasmin
Mitochondrial disorders with cognitive involvement
("mitochondrial disease" OR "mitochondrial encephalomyopathy" OR MELAS OR MERRF OR POLG) AND (cognit* OR dementia OR encephalopathy)

Journals reviewed

Article selection criteria

Included
  • New publications within the surveillance period addressing diagnosis, differential diagnosis, primary or secondary prevention, or treatment of an eligible condition.
  • Biomarkers, neuroimaging, diagnostic genetics, clinical criteria, pharmacological and non-pharmacological interventions, clinical trials, and treatment safety or efficacy.
  • Parkinson’s disease research only when cognition, cognitive impairment, dementia, or a relevant differential diagnosis is a substantial focus.
  • Rare adult leukoencephalopathies and genetic dementias, including CSF1R-related leukoencephalopathy, CADASIL, the adult leukodystrophies, Niemann-Pick type C, Kufs disease, FXTAS, cerebrotendinous xanthomatosis, Wilson disease and mitochondrial disorders with cognitive involvement. They are uncommon, frequently mistaken for commoner diagnoses, and several are treatable.
  • Review articles from any journal under surveillance, not only the review-focused titles; they are labelled and classified under Review so a synthesis is never presented as new data.
  • Clinically substantive letters, editorials, comments, or correspondence may be retained, but must be explicitly labelled by publication type and classified under Others; they are not treated as original research.
Excluded
  • Publications without a substantial connection to cognition, diagnosis, prevention, or treatment.
  • Letters, editorials, comments, or correspondence without a substantive clinical contribution.
  • Duplicate records identified using DOI, PMID, and normalized title.
  • Animal and cellular studies. This version of the report is restricted to human research.
  • Mechanistic research without a clear clinical diagnostic, preventive or therapeutic application.
  • General Parkinson’s disease treatment research with no cognitive relevance.
  • Articles from the Journal of Alzheimer’s Disease, excluded because its publication volume makes the monthly report impractically large.
  • Articles from the cognitive neuroscience titles retired from surveillance on 15 August 2026: NeuroImage, Human Brain Mapping, Cerebral Cortex, Cortex, Neuropsychologia, Neuropsychology, Journal of Cognitive Neuroscience, Brain and Cognition, Cognitive, Affective, & Behavioral Neuroscience, Neuropsychology Review, Trends in Cognitive Sciences and Neuroscience & Biobehavioral Reviews. They publish research on the healthy brain more often than research that changes a consultation, and in the July 2026 run they supplied 15 of the 58 articles left to review without a single priority suggestion.
  • Alzforum news items, which belong in a separate news tab and are not counted as scientific articles.

Search terms retrieve candidates. Matching a keyword is not sufficient for inclusion: the decision depends on clinical relevance after title-and-abstract screening, with the full text consulted when necessary and available.

Key findings: at most 5 key findings are selected on clinical impact, novelty or advance, evidence strength, field significance, timeliness. Selected after eligibility, from the articles that already qualify, in two stages: an article must first meet at least one key trigger — practice-changing, pivotal therapeutic, diagnostic or biomarker advance, safety, guideline or consensus, mechanistic, controversy-resolving, or a genuinely new direction — and only then is the strength of its evidence weighed. Key status is not an eligibility criterion. A maximum, not a quota, and judged against what else appeared in the same month. A month with fewer consequential findings publishes fewer, and none are promoted to fill the space.

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