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.
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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 UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Imaging Neuroscience |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1315735 |
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