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Highlights from the article: This indicates that motion illusions that elicit motion-in-depth cause more discomfort in observers than motion illusions eliciting lateral motion. We conclude that motion illusions eliciting motion-in-depth cause more discomfort in observers than motion illusions eliciting lateral motion which is represented in more postural swaying particularly in the antero-posterior direction. Sensitivity to such disparity-defined, cyclopean form may thus be set at both the level of early, absolute disparity measurements, defined in retinal co-ordinates and later, in the encoding of relative disparities (i.e. differences in disparity across space). To this end we used two different target-tracking conditions: 1) target movement was unpredictable, in which case delay adaptation is impossible; 2) target movement was predictable by presenting the movement trajectory ahead of time, in which case delay adaptation should occur (Rohde, van Dam & Ernst, JOV, 2014).