Graphical display of fMRI data: visualizing multidimensional space.
Visualization of multidimensional data is an integral part of computational statistics and exploratory data analysis (EDA). We show how visualization of fMRI time-courses may be used to reveal the fMRI data structure. We consider fMRI time-courses (TCs) as points in multidimensional space. In simulated and in vivo data, we show that minimum spanning tree (MST)-based sequencing of multivariate time-courses, in combination with a homogeneity map visualization, allows for effective and useful graphical display of the groups of coactivated time-courses obtained by temporal clustering. This display may serve as a tool for investigation of brain connectivity. We also suggest a simple overall display of the entire fMRI data set.
Baumgartner
R
R
Institute for Biodiagnostics, National Research Council Canada, 435 Ellice Ave., Winnipeg Manitoba, Canada R3B 1Y6.
Somorjai
R
R
D016477:Artifacts; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D003196:Computer Graphics; D003198:Computer Simulation; D003626:Data Display; D006801:Humans; D007089:Image Enhancement; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008432:Mathematical Computing; D009949:Orientation / Q000502:physiology; D010364:Pattern Recognition, Visual / Q000502:physiology; D019047:Phantoms, Imaging; D011340:Problem Solving / Q000502:physiology; D013996:Time and Motion Studies