title: Differential Effects of Parietal and Cerebellar Stroke in Response to Object Location Perturbation.
abstract: BACKGROUND
  The differential contributions of the cerebellum and parietal lobe to coordination between hand transport and hand shaping to an object have not been clearly identified.
  
  
  OBJECTIVE
  To contrast impairments in reach-to-grasp coordination, in response to object location perturbation, in patients with right parietal and cerebellar lesions, in order to further elucidate the role of each area in reach-to-grasp coordination.
  
  
  METHODS
  A two-factor design with one between subject factor (right parietal stroke; cerebellar stroke; controls) and one within subject factor (presence or absence of object location perturbation) examined correction processes used to maintain coordination between transport-to-grasp in the presence of perturbation. Sixteen chronic stroke participants (eight with right parietal lesions and eight with cerebellar lesions) were matched in age (mean = 61 years; standard deviation = 12) and hand dominance with 16 healthy controls. Hand and arm movements were recorded during unperturbed baseline trials (10) and unpredictable trials (60) in which the target was displaced to the left (10) or right (10) or remained fixed (40).
  
  
  RESULTS
  Cerebellar patients had a slowed response to perturbation with anticipatory hand opening, an increased number of aperture peaks and disruption to temporal coordination, and greater variability. Parietal participants also exhibited slowed movements, with increased number of aperture peaks, but in addition, increased the number of velocity peaks and had a longer wrist path trajectory due to difficulties planning the new transport goal and thus relying more on feedback control.
  
  
  CONCLUSIONS
  Patients with parietal or cerebellar lesions showed some similar and some contrasting deficits. The cerebellum was more dominant in controlling temporal coupling between transport and grasp components, and the parietal area was more concerned with using sensation to relate arm and hand state to target position.
authors.affiliation: School of Psychology, College of Life and Environmental Sciences, University of Birmingham , Edgbaston , UK.
authors.forename: Trudy A
authors.initials: TA
authors.lastname: Pelton
authors.affiliation: School of Psychology, College of Life and Environmental Sciences, University of Birmingham , Edgbaston , UK.
authors.forename: Alan M
authors.initials: AM
authors.lastname: Wing
authors.affiliation: School of Psychology, College of Life and Environmental Sciences, University of Birmingham , Edgbaston , UK.
authors.forename: Dagmar
authors.initials: D
authors.lastname: Fraser
authors.affiliation: School of Health Sciences, Faculty of Health and Medicine, The University of Newcastle , Callaghan, NSW , Australia ; Hunter Medical Research Institute, The University of Newcastle , Callaghan, NSW , Australia.
authors.forename: Paulette
authors.initials: P
authors.lastname: van Vliet
keywords: arm; coordination; hand; stroke; upper limb