We examined visually-guided reaching and perception in an individual who underwent resection of a small tumor in right intraparietal sulcus (pIPS). In the first experiment, she reached to targets presented on a touch screen. Vision was occluded from reach onset on half of the trials, whereas on the other half she had vision during the entire reach. For visually-guided reaching, she demonstrated significantly more reach errors for targets left of fixation versus right of fixation. However, there were no hemispatial differences when reaching without vision. Furthermore, her performance was consistent for reaches with either hand, providing evidence that pIPS encodes location based on an eye-centered reference frame. Second, previous studies reported that optic ataxics are more accurate when reaching to remembered versus visible target locations. We repeated the first experiment, adding a five second delay between stimulus presentation and reach initiation. In contrast to prior reports, she was less accurate in delayed versus immediate reaching. Finally, we examined whether a small pIPS resection would disrupt visuospatial processing in a simple perceptual task. We presented two small circles in succession in either the same location or offset at varying distances, and asked whether the two circles were presented in the same or different position. She was significantly more impaired left of fixation compared to right of fixation, providing evidence for a perceptual deficit after a dorsal stream lesion.

中文翻译：

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右顶壁损伤后行动和知觉受损。

我们检查了在右顶顶沟（pIPS）上切除了一个小肿瘤的个体的视觉引导范围和知觉。在第一个实验中，她达到了触摸屏上显示的目标。在一半的试验中，视力均无法达到范围，而另一半则在整个范围内均具有视力。对于视觉引导的到达，她展示了固定点左侧的目标与固定点右侧的目标明显更多的到达误差。但是，在没有视力的情况下没有半pat裂的差异。此外，她的表现对于两只手都可以保持一致，提供了pIPS根据以眼睛为中心的参考系对位置进行编码的证据。其次，先前的研究报告说，视觉共济失调在到达记忆目标位置与可见目标位置时更为准确。我们重复了第一个实验，在刺激提示和到达起始之间增加了五秒钟的延迟。与以前的报告相比，她在延误和立即到达方面的准确性较差。最后，我们检查了在简单的感知任务中小的pIPS切除术是否会破坏视觉空间处理。我们在相同的位置或以不同的距离偏移连续显示两个小圆圈，并询问两个圆圈是在相同位置还是在不同位置显示。与固定权相比，她的固定权受损明显更多，为背侧流病灶后的知觉缺陷提供了证据。她在延迟到达和立即到达方面的准确性较差。最后，我们检查了在简单的感知任务中小的pIPS切除术是否会破坏视觉空间处理。我们在相同的位置或以不同的距离偏移连续显示两个小圆圈，并询问两个圆圈是在相同位置还是在不同位置显示。与固定权相比，她的固定权受损明显更多，为背侧流病灶后的知觉缺陷提供了证据。与延迟到达相比，她的准确性较差。最后，我们检查了在简单的感知任务中小的pIPS切除术是否会破坏视觉空间处理。我们在相同的位置或以不同的距离偏移连续显示两个小圆圈，并询问两个圆圈是在相同位置还是在不同位置显示。与固定权相比，她的固定权受损明显更多，为背侧流病灶后的知觉缺陷提供了证据。