Get help now — free helplines

You can call any of these for free. You do not need a diagnosis, an appointment, or a crisis to call — questions and plain exhaustion are reasons enough.

  • Alzheimer's Association 24/7 Helpline 800-272-3900 24 hours a day, 365 days a year Free, confidential support and information for people with dementia, caregivers, families and the public. Master's-level clinicians. Also Spanish.
  • 988 Suicide & Crisis Lifeline 988 24/7 Call or text 988, or chat at 988lifeline.org. For anyone in emotional distress or a mental-health crisis, including caregivers.
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In a medical emergency, call 911. More numbers, and what each line does, on the help page.

Find studies

A note on reading research. One study is rarely the final word.

We try to note the size of a study, whether it was in humans or animals, and how early-stage the finding is. If a summary here doesn't make that clear, treat it with extra caution and check the original source.

(1) outlook in PD is heterogeneous, with most dying or developing dementia or postural instability by 10 years from diagnosis, but a quarter still doing well, with preserved mobility and intact cognition; (2) death is not directly related to PD in the majority; (3) baseline clinical and genetic variables are predictive of outcome and may be helpful in selecting patients for clinical trials. 1 key finding →

Participants: 142 Evidence: moderate

The overlap of amyotrophic lateral sclerosis and frontotemporal dementia

✓ Peer-reviewed alzhub usefulness score 59 out of 100. Neurology 2002-10-01

Patients with frontotemporal dementia (FTD) with no known diagnosis of ALS or family history of ALS were clinically and electrophysiologically assessed for the presence of ALS. 1 key finding →

Participants: 36 Evidence: low

Incidence of parkinsonism and PD increased with age, PD was the most common type of parkinsonism, and men had a risk of developing PD twice that of women. 2 key findings →

Participants: 4,341 Evidence: moderate

Amnestic syndrome of the medial temporal type identifies prodromal AD: a longitudinal study

✓ Peer-reviewed alzhub usefulness score 59 out of 100. Neurology 2007-11-01

The amnestic syndrome of the medial temporal type, defined by the Free and Cued Selective Recall Reminding Test, is able to distinguish patients at an early stage of Alzheimer disease from mild cognitive impairment non-converters. 2 key findings →

Participants: 251 Evidence: low

Longitudinal analysis revealed progressive and widespread changes in the grey matter, notably including the basal ganglia. 4 key findings →

Design: cross-sectional Participants: 36 Evidence: moderate

The evolution and pathology of frontotemporal dementia

✓ Peer-reviewed alzhub usefulness score 59 out of 100. Brain : a journal of neurology 2005-07-20

This is a clinicopathologic study of a prospective, clinic-based cohort of patients with frontotemporal dementia (FTD)/Pick complex, who were followed to autopsy. 1 key finding →

Participants: 32 Evidence: moderate

Co-morbidity of TDP-43 proteinopathy in Lewy body related diseases

✓ Peer-reviewed alzhub usefulness score 59 out of 100. Acta neuropathologica 2007-07-25

Here, we investigated if TAR-DNA-binding protein-43 (TDP-43), the disease protein in frontotemporal lobar degeneration and ubiquitin inclusions with or without motor neuron disease as well as amyotrophic lateral sclerosis, also formed inclusions in Lewy body (LB) disorders including Parkinson's disease (PD) without or with dementia (PDD), and dementia with LBs (DLB) alone or in association with Alzheimer's disease (AD). 3 key findings →

Evidence: low

Clinical, neuroimaging, and pathologic features of progressive nonfluent aphasia

✓ Peer-reviewed alzhub usefulness score 59 out of 100. Annals of neurology 1996-02-01

We report the clinical, neuroimaging, and neuropathologic features of progressive nonfluent aphasia (PNFA), a rare neurodegenerative syndrome most notable for its distinct language disturbance. 3 key findings →

Design: longitudinal study Evidence: moderate

Pharmacological treatment of Parkinson disease: a review

✓ Peer-reviewed alzhub usefulness score 59 out of 100. JAMA 2014-04-01

Although levodopa is the most effective medication available for treating the motor symptoms of Parkinson disease, in certain instances (eg, mild symptoms, tremor as the only or most prominent symptom, aged Conclusions and relevance Strong evidence supports using levodopa and dopamine agonists for motor symptoms at all stages of Parkinson disease. 1 key finding →

Evidence: low

The new mutation, E46K, of alpha-synuclein causes Parkinson and Lewy body dementia

✓ Peer-reviewed alzhub usefulness score 59 out of 100. Annals of neurology 2004-02-01

Familial parkinsonism and dementia with cortical and subcortical Lewy bodies is uncommon, and no genetic defect has been reported in the previously described sibships. 5 key findings →

Evidence: low

The two current major staging systems in use for Lewy body disorders fail to classify up to 50% of subjects. 3 key findings →

Participants: 417 Evidence: low

The innate immune system is implicated in Parkinson's disease (PD), but peripheral in-vivo clinical evidence of the components and driving mechanisms involved and their relationship with clinical heterogeneity and progression to dementia remain poorly explored. 4 key findings →

Design: longitudinal study Participants: 41 Evidence: moderate

Longitudinal outcome of Parkinson's disease patients with psychosis

✓ Peer-reviewed alzhub usefulness score 59 out of 100. Neurology 2003-06-01

Baseline data available from 59 patients enrolled in the PSYCLOPS (PSychosis and CLOzapine in PD Study) trial included age, age at onset of PD, duration of PD and psychosis, character of psychosis, medications, living setting, and scores for Mini-Mental State Examination (MMSE), Unified Parkinson's Disease Rating Scale, Hoehn and Yahr Scale, and Clinical Global Impression Scale. 4 key findings →

Design: longitudinal study Participants: 59 Evidence: moderate

Prognosis of Parkinson disease: risk of dementia and mortality: the Rotterdam Study

✓ Peer-reviewed alzhub usefulness score 59 out of 100. Archives of neurology 2005-08-01

Most prognostic studies on Parkinson disease have been hospital based or have applied register-based case-finding methods. 4 key findings →

Design: cohort study Participants: 6,969 Evidence: moderate

We identified individuals with an incident diagnosis of PD (n=1276) and controls (n=500 406) in UK Biobank. 4 key findings →

Participants: 1,276 Evidence: moderate

Dietary folate, vitamin B12, and vitamin B6 and the risk of Parkinson disease

✓ Peer-reviewed alzhub usefulness score 59 out of 100. Neurology 2006-07-01

Increased homocysteine levels might accelerate dopaminergic cell death in Parkinson disease (PD), through neurotoxic effects. 4 key findings →

Design: cohort study Participants: 5,289 Evidence: moderate

Familial aggregation of parkinsonism in progressive supranuclear palsy

✓ Peer-reviewed alzhub usefulness score 59 out of 100. Neurology 2009-05-20

Progressive supranuclear palsy (PSP) is a progressive neurodegenerative disorder characterized by aggregates of the microtubule-associated protein tau (MAPT). 4 key findings →

Design: case-control study Participants: 172 Evidence: moderate

Early onset hallucinations were significantly more common in pLBD than pAD (OR 0.069 [95% CI 0.012-0.397], p = 0.003) or mixed AD+LBD (OR 0.09 [95% CI 0.010-0.771], p = 0.028) and there was a greater increase in the odds of hallucinations over time in pAD and AD+LBD than pLBD such that there was was no difference in the prevalence of late-onset hallucinations between pLBD, pAD or AD+LBD. 5 key findings →

Design: cohort study Participants: 37 Evidence: moderate

Clinical diagnosis of progressive supranuclear palsy: The movement disorder society criteria

✓ Peer-reviewed alzhub usefulness score 59 out of 100. Movement Disorders 2017-05-03

Here, we present new criteria aimed to optimize early, sensitive, and specific clinical diagnosis of PSP on the basis of currently available evidence. © 2017 International Parkinson and Movement Disorder Society.

From across this tag

10 of the 1,021 studies in this tag, picked by a fixed rule (a hash of each study's address), not by score or date; each page of this list shows a different 10. The same 10 appear here every time.

↑ Change the filters

Where “Free full text” comes from

Free full text links and the Full text may need a subscription label come from Unpaywall, Europe PMC and OpenAlex records of free copies, checked 10 Oct 2026. A study with neither is unknown, not paywalled. Show only studies that are free to read

How the 0–100 score works — and why some entries are capped

This is alzhub's own score. It is not an official metric, not an impact factor, and no journal, publisher or ranking body endorses it. We built it so that a reader who is not a scientist can tell a landmark trial from a conference abstract without having to already know the difference. Every point comes from one of 20 components, all of them printed on the study itself, so you can disagree with our arithmetic rather than having to trust the total.

  • Journal tier up to 10 pts
  • Journal's citation record up to 4 pts
  • Study design up to 12 pts
  • Strength of evidence up to 5 pts
  • Peer-review validation up to 10 pts
  • How recent up to 5 pts
  • Sample size up to 4 pts
  • Effect reported up to 3 pts
  • Studied in people up to 3 pts
  • Randomised / blinded up to 2 pts
  • Times cited up to 7 pts
  • Citations per year up to 5 pts
  • Impact for its field and year up to 6 pts
  • Cited by studies here up to 6 pts
  • Still being cited up to 4 pts
  • Senior author's track record up to 4 pts
  • Institution's track record up to 3 pts
  • Multi-centre collaboration up to 3 pts
  • Indexed in PubMed up to 2 pts
  • Free to read up to 2 pts

Journals are placed in ordered tiers, never given a numeric impact factor — we could not verify current impact factors from a source we control, and an invented one would be worse than none. Tier 1 is the top-tier general journals (NEJM, The Lancet, JAMA, Nature, Science, Nature Medicine); tier 2 is the leading specialty journals; tier 3 is every other peer-reviewed journal. A separate part scores how much the journal's own papers are cited, which tells the tier-3 journals apart.

Two rules we don't bend. First, we never fill in a missing value: if a record does not state a sample size or a design, that component scores zero, and if we simply have no data for a part, such as a citation count, that part is left out and the study is scored on the parts we could check. The study card says which. Second, anything that is not a peer-reviewed article is capped at 16/100 and carries a warning chip — so a conference abstract or a company press release can never outrank a peer-reviewed paper, no matter how good it looks.

We rank a rigorous null result — a good trial showing that something does not work — above an early positive finding. Someone deciding whether to buy a supplement is served by that, and the rigour is already counted by the design and journal components.

The score is computed from the published data alone and is reproducible: the same file always yields the same numbers.

See the whole rubric drawn out → — four charts covering all 27,380 studies: how the scores are spread and where the cap bites, which of the 20 components the library is strong and weak on, which subjects rest on stronger evidence, and what kinds of study each subject is actually built from.

What this library is — and isn't

This is a large sample of the Alzheimer's literature, not an exhaustive index of it. It holds 27,380 records, built mostly from automated pulls of Europe PMC (60.6% of the library) and OpenAlex (18.6%), plus smaller pulls from PubMed, Crossref and medRxiv. If a study, a drug, or a finding isn't here, that is not evidence it doesn't exist in the literature — it may simply not have been pulled in yet.

1,032 records (3.8% of the library) are not peer-reviewed — 962 of those are preprints posted before any journal review, and the rest are conference abstracts, regulatory notices and reports. Every study card on this page states its status plainly, and the score above is capped for anything that isn't a peer-reviewed article.

See the full, machine-readable breakdown of this library's coverage →

Newest studies, as a dated timeline →    Atom feed