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How Many Subjects Constitute a Study?
Abstract
In fMRI there are two classes of inference: one aims to make a comment about the "typical" characteristics of a population, and the other about "average" characteristics. The first pertains to studies of normal subjects that try to identify some qualitative aspect of normal functional anatomy. The second class necessarily applies to clinical neuroscience studies that want to make an inference about quantitative differences of a regionally specific nature. The first class of inferences is adequately serviced by conjunction analyses and fixed-effects models with relatively small numbers of subjects. The second requires random-effect analyses and larger cohorts.
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“However, small sample sizes can be informative about typicality of a feature in a population, when features are identified in the majority of cases sampled[18].”
From In vivo PET imaging of neuroinflammation in familial frontotemporal dementia (2021) · cites this paper as [18]
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“続いて各被験者から得た推定パラメータ値で構成される画 像を用いて,被験者間の分散を考慮に入れた変動効果モデル によるグループ解析を行った[10].”
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Bedny, M., Aguirre, G. K., & Thompson‐Schill, S. L. (2007)
Metadata
- Authors
- Friston, K. J., Holmes, A. P., & Worsley, K. J.
- Affiliations
- National Hospital for Neurology and Neurosurgery (GB)
- ORCID
- Friston, Karl J.
- Venue
- NeuroImage
- Publisher
- Elsevier BV
- Published
- 1999-07
- Volume
- 10
- Issue
- 1
- Pages
- 1-5
- ISSN
- 1053-8119 (ISSN-L)
- OpenAlex
- W1966363088
- Cited by
- 814
- References
- 0
- Citations by year
- 2026: 2 · 2025: 6 · 2024: 3 · 2023: 7 · 2022: 9 · 2021: 8 · 2020: 17 · 2019: 13 · 2018: 10 · 2017: 15 · 2016: 31 · 2015: 27 · 2014: 22 · 2013: 35 · 2012: 30
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- NeuroImage (publishedVersion)
- PubMed (publishedVersion)
- UCL Discovery (University College London) (submittedVersion)
- Funders
- Wellcome Trust
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced MRI Techniques and Applications
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
- Keywords
- sample size, functional MRI, statistical inference, population inference, fixed effects model, random effects models, conjunction analysis, clinical neuroscience, functional anatomy, cohort size
- MeSH terms
- Data Interpretation, Statistical, Humans, Magnetic Resonance Imaging, Research Design, Models, Statistical, Cohort Studies, Patient Selection
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