Response-to-next-patient-stimulation: a right hemisphere syndrome. 
Eleven of 134 patients with a right hemisphere stroke responded to stimuli directed at other patients as if the stimuli were directed at them.  The stroke was severe in all 11 patients.  Associated disturbances included hemineglect, anosognosia, motor impersistence, disorientation (sometimes with agitated confusion), and somatosensory delusions and allesthesia.  This form of perseveration seems specific to acute right hemispheric stroke.