Pantazis, Dimitrios, Nichols, Thomas E., Baillet, Sylvain and Leahy, Richard M.. (2003) Spatiotemporal localization of significant activation in MEG using permutation tests. Lecture Notes in Computer Science, Vol.2732 . pp. 512-523. ISSN 0302-9743

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Abstract

This article describes a method for selecting design parameters and a particular sequence of events in fMRI so as to maximize statistical power and psychological validity. Our approach uses a genetic algorithm (GA), a class of flexible search algorithms that optimize designs with respect to single or multiple measures of fitness. Two strengths of the GA framework are that (1) it operates with any sort of model, allowing for very specific parameterization of experimental conditions, including nonstandard trial types and experimentally observed scanner autocorrelation, and (2) it is flexible with respect to fitness criteria, allowing optimization over known or novel fitness measures. We describe how genetic algorithms may be applied to experimental design for fMRI, and we use the framework to explore the space of possible fMRI design parameters, with the goal of providing information about optimal design choices for several types of designs. In our simulations, we considered three fitness measures: contrast estimation efficiency, hemodynamic response estimation efficiency, and design counterbalancing. Although there are inherent trade-offs between these three fitness measures, GA optimization can produce designs that outperform random designs on all three criteria simultaneously.

Item Type:	Journal Article
Subjects:	Q Science > QA Mathematics R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Divisions:	Faculty of Science > Statistics
Library of Congress Subject Headings (LCSH):	Magnetoencephalography -- Statistical methods, Spatial analysis (Statistics), Time-series analysis, Permutations
Journal or Publication Title:	Lecture Notes in Computer Science
Publisher:	Springer
ISSN:	0302-9743
Book Title:	Information Processing in Medical Imaging
Date:	2003
Volume:	Vol.2732
Page Range:	pp. 512-523
Identification Number:	10.1007/978-3-540-45087-0_43
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	National Institute of Biomedical Imaging and Bioengineering (U.S.) (NIBIB)
Grant number:	R01 EB002010 (NIBIB)
URI:	http://wrap.warwick.ac.uk/id/eprint/38234

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