... a measure of nongaussianity. Thus, (10.7) shows that ICA estimation by minimization of mutual in-formation is equivalent to maximizing the sum of nongaussianities of the estimates of the independent ... (ML)estimation and maximization of nongaussianity. In particular, this approach gives arigorous justification for the heuristic principle of nongaussianity. 10.1 DEFINING ICA BY MUTUAL INFORMATION10.1.1 ... and other measures of nongaussianity, enable the deflationary, i.e.,one -by- one, estimation of the independent components, since we can look forthe maxima of nongaussianity of a single projectionbTx....