A SEARCH COIL SYSTEM WITH AUTOMATIC FIELD STABILIZATION, CALIBRATION,AND GEOMETRIC PROCESSING FOR EYE-MOVEMENT RECORDING IN HUMANS

The search coil method, which has become standard in high precision ex perimental eye movement recording, requires stable magnetic fields of known strength, correction for offsets and other variable characterist ics of the recording electronics, calibration, and geometric interpret ation of the measured coil voltages. The search coil system presented here uses a digital microprocessor to achieve these aims automatically , thereby avoiding errors and time-consuming manual adjustments.