On Correlation Between Single-Trial ERP and GSR Responses: a Principal Component Regression Approach. - Perttu O. Ranta-aho; Mika P. Tarvainen; Stefanos Georgiadis; Juha-Pekka Niskanen; Pasi A. Karjalainen; Minna Valkonen-Korhonen; J. Lehtonen (EMBC, 2006)