Fig. 5From: Development of an electrooculogram-based eye-computer interface for communication of individuals with amyotrophic lateral sclerosisRemoval of interdependency between horizontal and vertical components. a Reference pattern, b signal before interdependency removal, c signal after interdependency removal, d difference plot of (b), and e difference plot of (c). x and y are the the normalized values of the horizontal and vertical signal, respectively; and dx and dy are the difference values of x and y, respectivelyBack to article page