Pain sensitivity alterations as a function of lesion location in the parasylvian cortex - PubMed (original) (raw)
Pain sensitivity alterations as a function of lesion location in the parasylvian cortex
Joel D Greenspan et al. Pain. 1999 Jun.
Abstract
Six patients with lesions involving parasylvian cerebral cortex were evaluated for their pain thresholds using contact heat (all six) and sharp probes that evoke pin-prick pain (4/6). Without knowledge of the sensory status of the individuals, two of the authors evaluated the MRIs of these patients, and determined to what extent the following cerebral regions were involved in the lesion: anterior insula, posterior insula, retroinsula, and parietal operculum. Each patient's lesion encompassed at least two of these regions. Three individuals demonstrated significant laterality differences in pain sensitivity, with elevated thresholds on the hand contralateral to his/her lesion. The common feature in these cases was the inclusion of the parietal operculum and posterior insula. The three other cases showed no evidence of abnormal pain thresholds. The common feature of these cases was the apparent sparing of the parietal operculum. Thus, this series of cases points to the significance of the parietal operculum, either alone or with adjacent posterior insula, for normal pain thresholds. In comparison, extensive involvement of the anterior insula in two cases was not associated with abnormal pain thresholds. Four of the six patients were also evaluated with a cold pain tolerance test, which presumably involves more affective/motivational aspects of pain than threshold tests. Only two of these patients showed greater tolerance contralaterally versus ipsilaterally, and theirs were the two lesions of the four with involvement of a large part of the insula. This result supports the theory that the insula's involvement in nociceptive processing is related to the affective/motivational aspect of pain.
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