A Patient with a Parietal Lesion Displaying an Inability to Release a Held Object in the Absence of Grasp Reflex or Instinctive Grasp Reactions

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  • Sakai Mariko
    Department of Rehabilitation, Yukoukai General Hospital. Department of Clinical Rehabilitation, Osaka Prefecture University Graduate School of Comprehensive Rehabilitation
  • Hirayama Kazumi
    Department of Occupational Therapy, Yamagata Prefectural University of Health Sciences
  • Goto Yasunobu
    Department of Neurosurgery, Saiseikai Ibaraki Hospital
  • Nishikawa Takashi
    Department of Rehabilitation, Faculty of Health Sciences, Naragakuen University

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  • 左頭頂葉病変により把握反射, 本能性把握反応を伴わず「つかんだものが放せない」症状を呈した 1 例

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Abstract

<p>  This article presents the case study of a patient with a metastatic tumor in the upper posterior area of the left postcentral gyrus. The patient displayed an inability to release objects that he grasped or pinched with his right hand. The symptoms occurred regardless of the object being held, the shape of the hand when grasping, and the fingers used to hold the object. The patient experienced clumsiness and could not appropriately hold tools in the right hand. However, the patient did not show paralysis and could perform complex finger movements. Grasp reflex or instinctive grasp reactions were not induced in this patient. Our findings suggest that the inability to release a held object could occur independently of grasp reflex and instinctive grasp reaction, and could be caused by parietal lesions.</p>

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