Analogue analyser for on-line eye movement detection.
A system of single movement detection is obtained by discriminating the velocities and orientations of eye ball displacements. The orthogonal components of eye velocity (Vx and Vy) are generated from the horizontal (X) and the vertical (Y) components of the movements by means of two derivative circuits and the velocity modulus (V) is generated through a vector operator from Vx and Vy. The onset and end of individual movements are detected on the basis of a preselected V, Vx or Vy threshold and, for every movement thus identified, the integral function of V(t), Vx(t) or Vy(t), characteristic of the type of movement, is generated in such a way that its final value represents ball displacement.
D004584:Electronystagmography / Q000295:instrumentation*; D008433:Mathematics