We have just had a paper on motion-in-depth published in Vision. This work demonstrates that different types of stimuli used to drive the Inter-Ocular Velocity Difference (IOVD) mechanism, may be driving different mechanisms, rather than the same one, as sometimes assumed.
Investigating human visual sensitivity to binocular motion-in-depth for anti- and de-correlated random-dot stimuli
Martin Giesel , Alex R. Wade, Marina Bloj and Julie M. Harris, Vision, in press.