Oculomotor prismatic training is effective in ameliorating spatial neglect: a pilot study.

Visuomotor prismatic training has been demonstrated to be among the most effective rehabilitative techniques of spatial neglect, a neurological syndrome manifested by a number of right brain-damaged patients characterized by unawareness of the egocentric left half of the world. In the present study, we demonstrate that a novel oculomotor prismatic training procedure only consisting in a sequence of gaze shifts to visual targets, can reduce spatial neglect symptoms. Following oculomotor prismatic training, patients show a significant decrease in neglect severity in straight ahead and paper and pencil tasks. We propose that during oculomotor prismatic training, the inconsistency between the prisms-biased visual/oculomotor input and the unbiased head-on-trunk proprioceptive information relative to the straight-ahead position determines the observed aftereffects and the amelioration of spatial neglect symptoms.