Abstract: Provided are computer-implemented methods for producing an index. The methods include conditioning electroencephalographic (EEG) signals present in an EEG recording previously obtained from an individual, e.g., an individual having dementia. In certain embodiments, the methods further include determining frequency domain features from the conditioned EEG signals, and determining connectivity features from the frequency domain features, where the connectivity features include connectivity features determined from a frequency range of from 35 Hz to 45 Hz divided into two or more sub-bands. The methods further include producing an index calculated at least in part as a function of one or more of the connectivity features determined from a frequency range of from 35 Hz to 45 Hz divided into sub-bands with varying contribution to the calculation of the index. Also provided are computer readable media and computer devices that find use, e.g., in practicing the methods of the present disclosure.