27,380 Alzheimer's and dementia studies in plain English, each scored out of 100.
Patients who failed to meet revised criteria were significantly older and most had atypical presentations with marked memory impairment. 2 key findings →
Evidence: low
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Participants: 108 Evidence: low
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The ACE is a brief and reliable bedside instrument for early detection of dementia, and offers a simple objective index to differentiate AD and FTD in mildly demented patients. 2 key findings →
Participants: 115 Evidence: low
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Reliability of the ACE-R was very good (alpha coefficient=0.8). 2 key findings →
Participants: 241 Evidence: low
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To determine the frequency of Alzheimer's disease (AD) pathology in patients presenting with progressive focal cortical syndromes, notably posterior cortical atrophy (PCA), corticobasal syndrome (CBS), behavioural variant frontotemporal dementia (bvFTD), progressive non-fluent aphasia (PNFA) (or a mixed aphasia) and semantic dementia (SD); and to compare the age of onset, evolution and prognosis in patients with focal cortical presentations of AD versus more typical AD and those with non AD pathology. 1 key finding →
Participants: 200 Evidence: low
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The term frontotemporal dementia (FTD) encompasses a range of clinical syndromes that are believed not to map reliably onto the spectrum of recognized pathologies. 2 key findings →
Participants: 61 Evidence: low
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Hippocampal atrophy is not specific for AD but is also seen in semantic dementia. 2 key findings →
Participants: 26 Evidence: low
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Frontotemporal lobar degeneration (FTLD) is the umbrella term encompassing a heterogeneous group of pathological disorders. 5 key findings →
Evidence: low
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FTD is a malignant disorder with limited life expectancy. 5 key findings →
Participants: 31 Evidence: low
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We have previously reported a large Danish pedigree with autosomal dominant frontotemporal dementia (FTD) linked to chromosome 3 (FTD3). 2 key findings →
Evidence: low
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Early reports of cognitive and behavioural deficits in motor neuron disease might have been overlooked initially, but the concept of a frontotemporal dementia-motor neuron disease continuum has emerged during the past decade. 5 key findings →
Evidence: low
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The cortical anatomy of 6 patients with semantic dementia (the temporal lobe variant of frontotemporal dementia) was contrasted with that of a group of age-matched normal subjects by using voxel-based morphometry, a technique that identifies changes in gray matter volume on a voxel-by-voxel basis. 4 key findings →
Evidence: low
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This study investigated cross-sectional and longitudinal neuropsychological data from 55 patients: 38 with Alzheimer's disease and 18 with mild cognitive impairment (MCI). 1 key finding →
Design: cross-sectional Participants: 55 Evidence: moderate
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Progressive and relatively circumscribed loss of semantic knowledge, referred to as semantic dementia (SD) which falls under the broader umbrella of frontotemporal dementia, was officially identified as a clinical syndrome less than 50 years ago. 4 key findings →
Design: longitudinal study Evidence: moderate
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Over the past decade it has become evident that a substantial minority of patients with primary dementing diseases, particularly those presenting in the presenium, have dementia of frontal lobe type (DFT) due to non-Alzheimer's pathology. 1 key finding →
Design: longitudinal study Participants: 52 Evidence: moderate
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One of the major symptoms of semantic dementia (or progressive fluent aphasia) is profound word-finding difficulties. 2 key findings →
Design: cross-sectional Evidence: moderate
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Semantic dementia (SD), one of the main clinical variants of frontotemporal dementia, presents a unique combination of clinical and imaging abnormalities. 5 key findings →
Evidence: low
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The results of this study provide objective validation of the ACE-III as a screening tool for cognitive deficits in FTD and AD. 2 key findings →
Participants: 33 Evidence: low
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Factor analysis showed four robust and meaningful symptom clusters: factor 1-stereotypic and eating behaviour; factor 2-executive dysfunction and self care; factor 3-mood changes; factor 4-loss of social awareness. 4 key findings →
Participants: 33 Evidence: low
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Patients with left and right predominant SD present with distinct behavioral-cognitive profiles. 3 key findings →
Participants: 36 Evidence: low
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A key aspect of social cognition is the ability to infer other people's mental states, thoughts and feelings; referred to as 'theory of mind' (ToM). 2 key findings →
Participants: 12 Evidence: low
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The double dissociation in performance on semantic memory and attention/executive function clearly separated the temporal and frontal variants of FTD and aids the early differentiation of FTD from AD. 3 key findings →
Evidence: low
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Change in eating behaviour was significantly more common in both of the frontotemporal dementia groups than in Alzheimer's disease. 2 key findings →
Participants: 23 Evidence: low
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Disinhibition is a common behavioural symptom in frontotemporal dementia but its neural correlates are still debated. 3 key findings →
Participants: 14 Evidence: low
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The speech of patients with progressive non-fluent aphasia (PNFA) has often been described clinically, but these descriptions lack support from quantitative data. 1 key finding →
Participants: 15 Evidence: low
Full summary, score breakdown and related studies → Original source Free full text
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
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.
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.
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 →