Somatosensory Deficits due to Lesions Including The Parietal Operculum

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  • 頭頂弁蓋部を含む病巣による体性感覚障害

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<p>  This report considers two cases presenting with somatosensory deficits due to lesions, including lesions of the parietal operculum. Both cases had severe deficits in basic somatosensory modalities but were capable of correctly identifying the cortical somatosensory modalities of three-dimensional geometric shapes, textures, and everyday objects at better than chance level. These results are inconsistent with the hierarchical model of somatosensory processing. The patients were also capable of dexterous movements, sufficient for completing everyday activities without inconvenience. This finding is contrary to the belief that somatosensory deficits impair motor control. In one of the two cases, the patient was observed to correctly respond to these tests, despite a complete lack of awareness of cortical somatosensation. This paper discusses the mechanism of these phenomena based on theories of the two streams of tactile information processing and the function of the secondary somatosensory cortex.</p>

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