Fig. 4From: Integrated space–frequency–time domain feature extraction for MEG-based Alzheimer’s disease classificationFeature heat maps for two modalities, magnetometer (first row) and gradiometer (second row), using data from all the participants of three classes: AD, MCI and HC. L-1, L-2 and L-3 indicate the level of decomposition. The horizontal axis indicates the recording lengthBack to article page