2) In the COGA project, people who underwent the clinical questionnaire and had blood drawn for genotyping did not always undergo the electrophysiological battery. Only a subset of the total Wave 1 and Wave 2 COGA data have corresponding electrophysiological data available. The subset of the COGA Wave 1 and Wave 2 subjects with resting eyes closed EEG data is 1,553 (as published in Porjesz et al. [8]). The subset of the COGA Wave 1 and Wave 2 subjects with Visual Oddball ERP data is 1337 (as published in Jones et al. [10]).
