EOG correction: a new perspective

Objective: In the field of EOG correction, discrepancies have been found between the propagation rates for different types and frequencies of eye movement. This study attempted to determine whether these differences could be explained by the affect of EOG magnitude on the correction procedure. Methods: Experiment 1 utilized simulated data to determine whether the combination of EOG magnitude and other forms of interference distorted the estimation of the propagation coefficients (Bs). Experiment 2 used real data to determine if the patterns obtained in Expt. 1 were apparent in real data. Results: Matched t tests found that simulated low power EOG produced inflated Bs as a function of interference in Expt. 1. Experiment 2 found the same relationship between B and EOG magnitude as with the simulations. Conclusions: The findings are consistent with the thesis that eye movement related fields propagate similarly for a range of EOG types and frequencies, suggesting that the B differences reported in the literature are artifactual, and indicating the need for a new correction procedure. (C) 1998 Elsevier Science Ireland Ltd. All rights reserved.