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A systems-level model of sleep-dependent memory-consolidation failure in neurodegeneration: the spindle–slow-oscillation decoupling cascade dissociates amyloid and tau
Masry B, Shahin A, Malek ZS.. bioRxiv, 2026-09-29
Topic: Disease mechanisms in lab and animal studies
We built a computer model that reproduces the rhythms and, crucially, lets the measured timing between slow waves and spindles control how strongly memories are written into cortex. As we gradually increase simulated pathology, the rhythms uncouple, memory consolidation fails, and overnight the model begins to forget rather than remember, exactly the trajectory seen in patients. When we scramble only the timing of the rhythms while leaving their strength untouched, consolidation collapses, showing that timing itself carries the memory benefit. The model separates amyloid (which weakens slow waves) from tau (which corrupts the hippocampal replay that timing is supposed to gate), and predicts that a leading experimental therapy (slow-wave stimulation during sleep) will help amyloid-dominated patients but fail tau-dominated patients even though it restores their slow waves. This prediction is directly testable and could guide patient selection for sleep-based interventions.
Key findings
- We built a computer model that reproduces the rhythms and, crucially, lets the measured timing between slow waves and spindles control how strongly memories are written into cortex.
- As we gradually increase simulated pathology, the rhythms uncouple, memory consolidation fails, and overnight the model begins to forget rather than remember, exactly the trajectory seen in patients.
- When we scramble only the timing of the rhythms while leaving their strength untouched, consolidation collapses, showing that timing itself carries the memory benefit.
- The model separates amyloid (which weakens slow waves) from tau (which corrupts the hippocampal replay that timing is supposed to gate), and predicts that a leading experimental therapy (slow-wave stimulation during sleep) will help amyloid-dominated patients but fail tau-dominated patients even though it restores their slow waves.
- This prediction is directly testable and could guide patient selection for sleep-based interventions.
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Study details
- Evidence strengthLow
How this study scored 16/100
Preprint — not yet peer-reviewed. It scored 21 on the same rubric, but non-peer-reviewed sources are capped at 16, so it shows as 16. Scored zero for study design, sample size, effect reported, studied in people and randomised / blinded because the record does not state it. We have no data on times cited, citations per year, impact for its field and year, cited by studies here, still being cited, senior author's track record, institution's track record and multi-centre collaboration, so those were left out: it earned 13 of the 62 points we could judge it on, which is 21 out of 100.
| Component | Points | Why |
|---|---|---|
| Journal tier | 2 / 10 | Tier 4 — not a peer-reviewed journal (bioRxiv) |
| Journal's citation record | 0 / 4 | Not a journal article, so the journal's record does not count |
| Study design | 0 / 12 | No study design recorded — scores zero, not guessed (not stated in the record — scored 0) |
| Strength of evidence | 1 / 5 | Rated “low” in our summary |
| Peer-review validation | 4 / 10 | Preprint — not yet peer-reviewed. Hosted on a preprint server. |
| How recent | 5 / 5 | 2026 — within 1 year(s) of the newest study here |
| Sample size | 0 / 4 | Participant count not stated — scores zero (not stated in the record — scored 0) |
| Effect reported | 0 / 3 | No effect size reported — scores zero (not stated in the record — scored 0) |
| Studied in people | 0 / 3 | Not stated whether this was studied in people — scores zero (not stated in the record — scored 0) |
| Randomised / blinded | 0 / 2 | No randomisation or blinding stated — scores zero (not stated in the record — scored 0) |
| Times cited | — / 7 | No citation count (not found in OpenAlex) — left out of this score |
| Citations per year | — / 5 | No citation count or no year — left out of this score |
| Impact for its field and year | — / 6 | No field-weighted citation impact (OpenAlex has none yet) — left out of this score |
| Cited by studies here | — / 6 | Not yet checked against this library's citation graph — left out of this score |
| Still being cited | — / 4 | No yearly citation counts — left out of this score |
| Senior author's track record | — / 4 | Senior author's record not available — left out of this score |
| Institution's track record | — / 3 | No institution listed in OpenAlex — left out of this score |
| Multi-centre collaboration | — / 3 | Institutions not listed — left out of this score |
| Indexed in PubMed | 1 / 2 | Not in PubMed, but has a DOI |
| Free to read | 0 / 2 | Behind a paywall — scores zero |
| Points | 13 / 62 | Scored on 12 of 20 parts. We have no data for the rest, so they are left out: 13 of the 62 points we could judge it on is 21 out of 100. |
| Total | 21 / 100 | Capped to 16 because this is not a peer-reviewed article. |
What each of these 20 components measures, and what this score is not →
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Cite this study APA, Vancouver, BibTeX · download .bib or .ris
Built from the record alzhub holds for this paper, not looked up. Volume, issue and page numbers are not held in the record. Check the citation against the original before you use it.
APA 7th
Masry, B., Shahin, A., & Malek, Z. S. (2026). A systems-level model of sleep-dependent memory-consolidation failure in neurodegeneration: the spindle–slow-oscillation decoupling cascade dissociates amyloid and tau. bioRxiv. https://doi.org/10.64898/2026.09.21.753161
Vancouver
Masry B, Shahin A, Malek ZS. A systems-level model of sleep-dependent memory-consolidation failure in neurodegeneration: the spindle–slow-oscillation decoupling cascade dissociates amyloid and tau. bioRxiv. 2026. doi:10.64898/2026.09.21.753161.
BibTeX
@article{masry2026-9fa132e6,
author = {Masry, B. and Shahin, A. and Malek, Z. S.},
title = {{A systems-level model of sleep-dependent memory-consolidation failure in neurodegeneration: the spindle–slow-oscillation decoupling cascade dissociates amyloid and tau}},
journal = {bioRxiv},
year = {2026},
doi = {10.64898/2026.09.21.753161},
url = {https://doi.org/10.64898/2026.09.21.753161}
}
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