Evidence map›Paper›PMID 34257387›Full record

ArticleScientific reports2021

Drinking coffee enhances neurocognitive function by reorganizing brain functional connectivity.

Hayom Kim, Sung Hoon Kang, Soon Ho Kim, Seong Hwan Kim, Jihyeon Hwang, Jae-Gyum Kim, Kyungreem Han, Jung Bin Kim

Abstract read
In one paragraph

Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed
–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

16 citing papers in PubMed.

  1. Trial
  2. Observational
  3. Article
  4. Association between caffeine intake and fat free mass index: a retrospective cohort study.Journal of the International Society of Sports Nutrition · 2025
    Article
  5. Article
  6. Article
  7. Coffee as a Source of Antioxidants and an Elixir of Youth.Antioxidants (Basel, Switzerland) · 2025
    Review
  8. Observational
  9. Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Article
  15. Review
  16. 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

8 authors.

Hayom KimDepartment of Neurology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Republic of Korea.
Sung Hoon KangDepartment of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
Soon Ho KimLaboratory of Computational Neurophysics, Brain Science Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea.
Seong Hwan KimDepartment of Neurology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Republic of Korea.
Jihyeon HwangDepartment of Neurology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Republic of Korea.
Jae-Gyum KimDepartment of Neurology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Republic of Korea.
Kyungreem HanLaboratory of Computational Neurophysics, Brain Science Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea. khan@kist.re.kr.
Jung Bin KimDepartment of Neurology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Republic of Korea. kjbin80@korea.ac.kr.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The purpose of this study was to identify the mechanisms underlying effects of coffee on cognition in the context of brain networks. Here we investigated functional connectivity before and after drinking coffee using graph-theoretic analysis of electroencephalography (EEG). Twenty-one healthy adults voluntarily participated in this study. The resting-state EEG data and results of neuropsychological tests were consecutively acquired before and 30 min after coffee consumption. Graph analyses were performed and compared before and after coffee consumption. Correlation analyses were conducted to assess the relationship between changes in graph measures and those in cognitive function tests. Functional connectivity (FC) was reorganized toward more efficient network properties after coffee consumption. Performance in Digit Span tests and Trail Making Test Part B improved after coffee consumption, and the improved performance in executive function was correlated with changes in graph measures, reflecting a shift toward efficient network properties. The beneficial effects of coffee on cognitive function might be attributed to the reorganization of FC toward more efficient network properties. Based on our findings, the patterns of network reorganization could be used as quantitative markers to elucidate the mechanisms underlying the beneficial effects of coffee on cognition, especially executive function.

Indexed as

BrainCoffeeCognitionElectroencephalographyAdultExecutive FunctionFemaleHumansMaleNerve NetNeuropsychological TestsYoung AdultCoffee

Identifiers

PMID34257387
PMCPMC8277884

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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.