Supervised dictionary learning of EEG signals for mild cognitive impairment diagnosis

•An accurate and reliable EEG-based screening tool for MCI diagnosis namely CLC-KSVD is introduced.•CLC-KSVD is applied on extracted patches also extracted spectral features from EEG.•The best accuracy of 88.9% was obtained in F7, T3 channels and LT zone.•Volumetric analysis of MR images shows that results are anatomically interpretable.•Best area is superior temporal & pars triangularis in left hemisphere.