The major question addressed in this investigation is: can one pinpoint relationships between acoustic phasing patterns and tongue body kinematic phasing patterns in the production of vocalic quantity contrasts? If so, to what extent could kinematic phasing patterns be inferred from acoustic phasing patterns? Regularities, that may unveil articulatory-acoustic relations, represent crucial information in trying to recover articulatory gestures from speech sounds. This investigation is thus, a contribution, hopefully, to understanding the complex ill-posed problem of inverse mapping.