Several studies have further addressed a potential relationship between qEEG changes and the APOE status in patients with AD; however, the results have been conflicting thus far, reporting accentuated EEG slowing in APOE ε4 carriers [40,41], more severe EEG slowing in APOE ε4 non-carriers [42], and no differences in relation to the APOE status [43]. The gene discussed is APOE; the disease is Alzheimer disease.