An adjustment to eye movement measurements that compensates for the eccentric position of the eye relative to the center of the head.

We describe a procedure for modifying horizontal eye movement measurements in a way that effectively removes signal contributions due to the eccentric location of the eyes relative to the center of rotation of the head. This procedure helps standardize measured signals so that data collected under different experimental conditions and from different subjects may be compared directly. We also present techniques for accurately determining specific parameters of head geometry that are required by the procedure. This method may be used for modifying eye movement responses to visual target motion, head motion, or both, and does not assume continual fixation of the visual target. Also, this method may be employed when either curved (iso-distance) or flat display screens are used for presenting the visual stimuli.