...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Journal of Neuroscience: The Official Journal of the Society for Neuroscience >Dissociating detection from localization of tactile stimuli.
【24h】

Dissociating detection from localization of tactile stimuli.

机译：从触觉刺激的本地化分离检测。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In what they described as "a tactile analog of blindsight," Paillard et al. (1983) reported the case of a woman with damage to the left parietal cortex who was profoundly impaired in detecting tactile stimuli but could nonetheless correctly identify their location (also Rossetti et al., 1995). This stands in direct contrast to reports of neurological patients who were unable to accurately locate stimuli that they could successfully detect (Head and Holmes, 1911; Halligan et al., 1995; Rapp et al., 2002). The combination of these findings suggests that detecting and locating tactile stimuli are doubly dissociable processes, presumably mediated by different neural structures. We conducted four psychophysical experiments seeking evidence for such a double dissociation in neurologically intact subjects. We compared people's accuracy in detecting versus locating a tactile stimulus presented to one of four fingers and followed by a vibrotactile mask presented to all four fingers. Accuracy scores for both theyes-no detection and four-alternative forced-choice location judgments were converted to a bias-free measure (d'), which revealed that subjects were better at detecting than locating the stimulus. Detection was also more sensitive than localization to manipulations involving the mask: detection accuracy increased more steeply than localization accuracy as the target-mask interval increased, and detection, but not localization, was affected by changes in the mask frequency. By comparing these results with simulated data generated by computational models, we conclude that detection and localization are not mutually independent as previous neurological studies might suggest, but rather localization is subsequent to detection in a serially organized sensory processing hierarchy.
机译：Paillard等人在他们所描述的“视力的触觉类似物”中。 （1983年）报道了一例左顶叶皮质受损的妇女，该妇女在检测触觉刺激时受到严重损害，但仍然可以正确地确定其位置（Rossetti等，1995）。这与神经病患者无法准确定位可以成功检测到的刺激的报道形成鲜明对比（Head and Holmes，1911; Halligan等，1995; Rapp等，2002）。这些发现的结合表明，检测和定位触觉刺激是双重可分离的过程，大概是由不同的神经结构介导的。我们进行了四个心理物理实验，以寻找在神经完整的受试者中这种双重解离的证据。我们比较了人们在检测和定位出现在四个手指上的触觉刺激以及定位在所有四个手指上的触觉掩膜的准确性。将没有检测到的选择和四项强制选择的位置判断的准确率分数转换为无偏差量度（d'），这表明受试者比定位刺激物更好地进行检测。检测也比定位对掩膜的操作更敏感：随着目标-掩膜间隔的增加，检测精度比定位精度的上升幅度更大，并且检测（而非定位）受掩模频率变化的影响。通过将这些结果与计算模型生成的模拟数据进行比较，我们得出的结论是，检测和定位并不像先前的神经学研究表明的那样相互独立，而是定位在检测后的一系列有组织的感觉处理层次结构中。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号