A SELF-CALIBRATION METHOD USING A SOFT CLUSTERING PROCEDURE FOR EYE-MOVEMENT RECORDINGS

A nearly automatic method for calibrating eye movement records has bee n developed. This very robust method is based on a soft clustering alg orithm which allows exploration of the whole range of eye movement rec ords for reliable calibration. In contrast to many other methods which carry out the calibration on several discrete points, this method is suitable for continuous determination of the transfer function of the eye movement transducer. Moreover it simultaneously uses the combined properties of vestibule-ocular reflex, neck-to-eye reflex and smooth p ursuit system to reach approximately a unity gain and zero phase lag ( in subjects with no severe vestibular disorders or ocumomotor palsy). In addition, this method does not rely heavily on the degree of attent ion of the subject. The method is particularly suited for the calibrat ion of non linear or noisy transducers like Electro Oculography (EOG). Calibration is performed within a few seconds. So when necessary in c linical applications it is possible to repeat calibrations frequently. (C) 1998 Elsevier Science B.V. All rights reserved.