Is Bimanual Interference Affected in the Case of a Central Proprioceptive Loss? New Insight From a Left-Brain-Damaged Single-Case Study

Objective: It was suggested that the bimanual coupling effect might be linked to motor intentionality and planning, which are the top-down components of motor execution. However, previous results in pathological and healthy individuals have also underlined the pivotal role of bottom-up sensorimotor information. Method: In this single-case study, the Circles−Lines Coupling Task was administered to a left-parietal-brain-damaged individual. The cerebral lesion caused a central proprioceptive loss, relative to the impaired right hand, when out of the visual control. For the 1st time in literature, we sought to investigate whether the movement of the unaffected hand induced an efficient coupling effect on the movement of the affected one. The bimanual task was performed in the presence and absence of visual input. The patient’s performance was compared with that of healthy controls. Results: We observed the traditional bimanual coupling effect in healthy controls. Moreover, we also replicat...