Phantoms on the hands: Influence of the body on brief synchiric visual percepts.
Phantoms on the hands: Influence of the body on brief synchiric visual percepts.
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DOI：
10.1016/j.neuropsychologia.2016.01.016
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发表时间：
2016-02
期刊：
影响因子：
2.6
通讯作者：
Coslett HB
中科院分区：
文献类型：
--
作者：
Medina J;Drebing DE;Hamilton RH;Coslett HB
最近的研究发现，优先反应的简短，短暂的视觉刺激附近的手，这表明大细胞视觉处理和perperipersonal表征之间的联系。我们报告一个人与右半球病变的错觉幻影感知可能是由于在peripersonal系统特定的瞬态视觉刺激的损害。当向她的同侧呈现单一的、短暂的（250 ms）视觉刺激时，她报告了两侧的视觉感知-联错。当视觉刺激出现在手上时，这些对侧病变幻影的发生率明显高于手。接下来，我们操纵刺激持续时间来研究这些幻影感知和瞬态视觉处理之间的关系。我们发现了一个显着的位置，持续时间的相互作用，大大更多的幻影synchiric感知的手相比，持续的刺激。这种缺陷提供了新的证据，优先处理的瞬时视觉刺激附近的手，和机制，当损坏时，导致幻影感知。
Recent studies have found preferential responses for brief, transient visual stimuli near the hands, suggesting a link between magnocellular visual processing and peripersonal representations. We report an individual with a right hemisphere lesion whose illusory phantom percepts may be attributable to an impairment in the peripersonal system specific to transient visual stimuli. When presented with a single, brief (250 ms) visual stimulus to her ipsilesional side, she reported visual percepts on both sides – synchiria. These contralesional phantoms were significantly more frequent when visual stimuli were presented on the hands versus off the hands. We next manipulated stimulus duration to examine the relationship between these phantom percepts and transient visual processing. We found a significant position by duration interaction, with substantially more phantom synchiric percepts on the hands for brief compared to sustained stimuli. This deficit provides novel evidence both for preferential processing of transient visual stimuli near the hands, and for mechanisms that, when damaged, result in phantom percepts.