EOG correction: a new perspective

Objective: In the field of EOG correction, discrepancies have been found be tween the propagation rates for different types and frequencies of eye move ment. 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 comb ination of EOG magnitude and other forms of interference distorted the esti mation 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 inflat ed 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 artifact ual, and indicating the need for a new correction procedure. (C) 1998 Elsev ier Science Ireland Ltd. All rights reserved.