... application.371 Independent Component Analysis. Aapo Hyv¨arinen, Juha Karhunen, Erkki OjaCopyright 2001 John Wiley & Sons, Inc.ISBNs: 0-4 7 1-4 0540-X (Hardback); 0-4 7 1-2 213 1-7 (Electronic)372OTHER ... dependency structure of estimates of independent components could be based, for example, on computing the cross-cumulants. Typ-ically these would be higher-order cumulants, since second-order cross-cumulants,i.e., ... the methods of independent subspaces or topographic ICA, on the other hand,we assume that we cannot really find independent components; instead we canfind groups of independent components, or components...