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Effective degrees of freedom and the RFT resel count

Ridgway, GR; Barnes, G; Friston, K; (2011) Effective degrees of freedom and the RFT resel count. Presented at: 17th Annual Meeting of the Organization for Human Brain Mapping, Quebec, Canada. Green open access

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Abstract

In one of neuroimaging's key papers, Worsley et al. (1992) introduced the concept of a resolution element (resel) as an intuitive parametrisation of the roughness-adjusted search volume underlying random field theory's expression for corrected p-values. In another key development, Worsley and Friston (1995) showed that temporal correlation in a linear model reduced the effective degrees of freedom (eDF). Here, we illustrate a surprising connection between these quantities, which may have application to multiple comparison correction on data with elaborate statistical dependence that can make RFT over-conservative.

Type: Poster
Title: Effective degrees of freedom and the RFT resel count
Event: 17th Annual Meeting of the Organization for Human Brain Mapping
Location: Quebec, Canada
Open access status: An open access version is available from UCL Discovery
Publisher version: http://www.humanbrainmapping.org/hbm2011/
Language: English
Keywords: random field theory, resels, effective degrees of freedom
UCL classification: UCL > School of Life and Medical Sciences
UCL > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Neurology
UCL > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Neurology > Imaging Neuroscience
URI: http://discovery.ucl.ac.uk/id/eprint/1315735
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