A “matched” sensory reference can guide goal-directed movements of the affected hand in central post-stroke sensory ataxia
- 252 Downloads
Patients with central post-stroke sensory ataxia (CPSA) suffer from not only somatosensory dysfunction but also the ataxic movement disorder of the affected limb. These sensory and motor impairments possibly interfere each other, but such interference is still unclear. We evaluated smoothness of grasp movements in CPSA patients using a kinematic analysis, and verified the effect of somatosensory reference from the intact hand on grasp movements. Eight CPSA patients were enrolled. We recorded their reach-and-pinch movements of both affected and intact hands toward the tip of the 3-cm-diameter vertical bar, using a three-dimensional measurement system. When executing these movements of one hand, the patients simultaneously pinched the same diameter bar as the goal tip (matched-reference condition: Matched-Ref) or the 5-cm-diameter thicker bar (mismatched-reference condition: Mismatched-Ref) by the other hand. The normalized jerk index (i.e., movement smoothness) of the affected hand was disturbed compared with the intact hand. The kinematic data of the finger opening and closing phases were also disturbed. These disturbances were partially improved with Matched-Ref but not Mismatched-Ref of the intact hand. We successfully evaluated the features of CPSA, indicating that the somatosensory reference method could be useful for rehabilitation in sensory ataxia.
KeywordsSensory ataxia Motor control Bimanual coupling
This study was supported by a grant from JSPS KAKENHI Grant numbers 17K13080 and 17H05915.
Compliance with ethical standards
Conflicts of interest
The authors have no conflicts of interest to declare.
- Cohen J (1988) Statistical power analysis for the behavioral sciences, 2nd edn. Routledge Academic, New YorkGoogle Scholar
- Dworkin RH, Turk DC, Revicki DA, Harding G, Coyne KS, Peirce-Sandner S, Bhagwat D, Everton D, Burke LB, Cowan P, Farrar JT, Hertz S, Max MB, Rappaport BA, Melzack R (2009) Development and initial validation of an expanded and revised version of the Short-form McGill Pain Questionnaire (SF-MPQ-2). Pain 144:35–42CrossRefPubMedGoogle Scholar
- Fujisaki W (2012) Effects of delayed visual feedback on grooved pegboard test performance. Front Psychol 8:61Google Scholar
- Seki M, Hase K, Takahashi H, Liu M (2014) Comparison of three instruments to assess changes of motor impairment in acute hemispheric stroke: the Stroke Impairment Assessment Set (SIAS), the National Institute of Health Stroke Scale (NIHSS) and the Canadian Neurological Scale (CNS). Disabil Rehabil 36:1549–1554CrossRefPubMedGoogle Scholar