Evidence map›Paper›PMID 30271944›Full record

ArticleCommunications biology2018

Small sample sizes reduce the replicability of task-based fMRI studies.

Benjamin O Turner, Erick J Paul, Michael B Miller, Aron K Barbey

Registry-linked trialAbstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Communications biology, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT06606925 (Determining Which Regions of the Brain Are Active During Flight Simulation at Separate Timepoints During Training), which is not on this map. Cited by 190 papers, 18 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
190citing papers in PubMed, 18 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.

NCT06606925 nacompletednot on this mapstarted 2023, after this paper: background citation

Determining Which Regions of the Brain Are Active During Flight Simulation at Separate Timepoints During Training

TypeinterventionalSponsorThe Geneva FoundationRan2023 to 2026Enrolled35ConditionsCognitive PerformanceArmsfMRI with virtual reality flight simulator
3 · Its place in the literature

Who cites it

190 citing papers in PubMed, 18 syntheses or guidelines pooled it.

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130 more citing papers are in PubMed but not listed here.

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

4 authors.

Benjamin O TurnerWee Kim Wee School of Communication and Information, Nanyang Technological University, Singapore, 639798, Singapore.
Erick J PaulMicrosoft Corporation, 1 Microsoft Way, Redmond, WA, 98052, USA.
Michael B MillerDepartment of Psychological & Brain Sciences, University of California, Santa Barbara, CA, 93106, USA.
Aron K BarbeyDepartment of Psychology, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA. barbey@illinois.edu.ORCID http://orcid.org/0000-0002-6092-0912

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Despite a growing body of research suggesting that task-based functional magnetic resonance imaging (fMRI) studies often suffer from a lack of statistical power due to too-small samples, the proliferation of such underpowered studies continues unabated. Using large independent samples across eleven tasks, we demonstrate the impact of sample size on replicability, assessed at different levels of analysis relevant to fMRI researchers. We find that the degree of replicability for typical sample sizes is modest and that sample sizes much larger than typical (e.g.,

Identifiers

PMID30271944
PMCPMC6123695

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Registered trials

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.