Evidence map›Paper›PMID 29040672›Full record

ArticleNeurosurgery2018

Unsupervised Learning of Spatiotemporal Interictal Discharges in Focal Epilepsy.

Maxime O Baud, Jonathan K Kleen, Gopala K Anumanchipalli, Liberty S Hamilton, Yee-Leng Tan, Robert Knowlton, Edward F Chang

Abstract read
In one paragraph

Article in Neurosurgery, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
23citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

23 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
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  7. Article
  8. Article
  9. Review
  10. Article
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  12. Review
  13. Classifying epilepsy pragmatically: Past, present, and future.Journal of the neurological sciences · 2021
    Review
  14. Article
  15. Article
  16. Article
  17. Under-sampling in epilepsy: Limitations of conventional EEG.Clinical neurophysiology practice · 2021
    Review
  18. Article
  19. Review
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors.

Maxime O BaudDepartment of Neurological surgery, University of California, San Francisco, California.
Jonathan K KleenDepartment of Neurology, University of California, San Francisco, California.
Gopala K AnumanchipalliDepartment of Neurological surgery, University of California, San Francisco, California.
Liberty S HamiltonDepartment of Neurological surgery, University of California, San Francisco, California.
Yee-Leng TanDepartment of Neurology, University of California, San Francisco, California.
Robert KnowltonDepartment of Neurology, University of California, San Francisco, California.
Edward F ChangDepartment of Neurological surgery, University of California, San Francisco, California.

Funding

NINDS Research Education Programs for Residents and Fellows in Neurology, Neurosurgery, Neuropathology, Neuroradiology and Emergency Medicine (R25)R25NS070680 · NINDS · UNIVERSITY OF CALIFORNIA, SAN FRANCISCO · PI JOSEPHSON, SCOTT ANDREW · 2010 to 2023
$6.8M
NINDS NIH HHS R25 NS070680
6 · The paper itself

Abstract

backgroundInterictal epileptiform discharges are an important biomarker for localization of focal epilepsy, especially in patients who undergo chronic intracranial monitoring. Manual detection of these pathophysiological events is cumbersome, but is still superior to current rule-based approaches in most automated algorithms.

objectiveTo develop an unsupervised machine-learning algorithm for the improved, automated detection and localization of interictal epileptiform discharges based on spatiotemporal pattern recognition.

methodsWe decomposed 24 h of intracranial electroencephalography signals into basis functions and activation vectors using non-negative matrix factorization (NNMF). Thresholding the activation vector and the basis function of interest detected interictal epileptiform discharges in time and space (specific electrodes), respectively. We used convolutive NNMF, a refined algorithm, to add a temporal dimension to basis functions.

resultsThe receiver operating characteristics for NNMF-based detection are close to the gold standard of human visual-based detection and superior to currently available alternative automated approaches (93% sensitivity and 97% specificity). The algorithm successfully identified thousands of interictal epileptiform discharges across a full day of neurophysiological recording and accurately summarized their localization into a single map. Adding a temporal window allowed for visualization of the archetypal propagation network of these epileptiform discharges.

conclusionUnsupervised learning offers a powerful approach towards automated identification of recurrent pathological neurophysiological signals, which may have important implications for precise, quantitative, and individualized evaluation of focal epilepsy.

Indexed as

AlgorithmsUnsupervised Machine LearningAdultAgedElectroencephalographyEpilepsies, PartialFemaleHumansMaleMiddle AgedRetrospective StudiesSeizures

Identifiers

PMID29040672
PMCPMC6454796

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.