Fitting rVOR responses using current models

The slow phase velocity of the rVOR response to a step of constant velocity head rotation is best represented by a model with two time constants. Two main models, based on different physiological hypotheses, have been proposed in the literature. Although their structures and their parameters are different, these two models have often been considered mathematically identical. Here we compare them, highlighting their differences and showing which parameters are more representative and giving hints on which model to use when fitting rVOR responses having different morphologies.