V-to-V anticipatory coarticulation is frequently taken as an indicator of the anticipated planning of an up-coming vowel, and thus the manifestation of a process where context-dependent speech targets or coordinated gestures are planned together before execution (e.g. [1], [2], [3]). In this study, V-to-V anticipatory coarticulation in French is compared in 4 groups of patients presenting different Motor Speech Disorders-Apraxia of Speech (AoS) and 3 types of dysarthrias associated with Amyotrophic Lateral Sclerosis (D-ALS), Parkinson (D-Pk) and Wilson (D-Wl) diseases-with the aim of getting further insights into the understanding of the control of coarticulation in speech (as in [4], [5], [6]). It is hypothesized that perturbed coarticulatory patterns may arise as a consequence of disruption in the planning and sequencing of speech targets into cohesive speech units, as expected in AoS where speech is often described as 'syllabified' or 'segmentalized'. However, it can also derive from deficits in the motor programming or execution of speech whose consequences are slower movements, restricted displacement and/or perturbed coordination between gestures, as can be encountered in dysarthria. So far, inconsistent results have been found in the literature regarding coarticulatory patterns in different MSD (see [5] & [6]). Moreover, AoS patients are more often compared to patients with aphasia than to patients with dysarthria. More data is thus needed to understand whether deficits linked to distinct cerebral disorders do impact coarticulation, and how they can shed light on the levels and units over which coarticulation is planned.