physically attacked people by stretching them or cutting off their legs, so as to force them to ﬁt the size of an iron bed. In general, when something is Procrustean, different lengths or sizes or properties are ﬁtted to an arbitrary standard.
́ephane Bonnet, Marco Congedo, Christian Jutten 1. Spatial ﬁlters enhancing the SNR class-wise (8 virtual signals) 2. New trials based on incoming and averaged evoked signals 3. Spatial covariance between ensuing signals 4. Apply Riemannian geometry as descriptor: (R distance, mean, tangent mapping) 5. Map to eucledian space and ﬁt + classify
Ridge Regression •constraint linear model (cf. beamformer, S-LORETA, ...) •Gaussian, uncorrelated noise •whitening via covariance ˆ X = RGt(GRGt + C) 1Y ˆ X = R ˜ Gt( ˜ GR ˜ Gt + I) 1 ˜ Y unwhitened whitened 98.749% M/EEG users used whitening ˆ X = RGt(GRGt + C) 1Y ˆ X = R ˜ Gt( ˜ GR ˜ Gt + I) 1 ˜ Y
a common feature space • Strategy 2: Condense, compress individual spatial and temporal features in dedicated e.g. geometrical metrics and just learn on a few features. • Stragey 3: Reduce sample bias and estimation variance by learning regularizaiton parameters from the data