...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Cortex: A Journal Devoted to the Study of the Nervous System and Behavior >Steady-state visual evoked potentials reveal enhanced neural responses to illusory surfaces during a concurrent visual attention task
【24h】

Steady-state visual evoked potentials reveal enhanced neural responses to illusory surfaces during a concurrent visual attention task

机译：稳态视觉诱发电位揭示了在并发的视觉关注任务期间对幻觉表面的增强神经响应

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

Under natural viewing conditions, visual stimuli are often obscured by occluding surfaces. To aid object recognition, the visual system actively reconstructs the missing information, as exemplified in the classic Kanizsa illusion, a phenomenon termed "modal completion". Single-cell recordings in monkeys have shown that neurons in early visual cortex respond to illusory contours, but it has proven difficult to measure the neural correlates of modal completion in humans. We used electroencephalography (EEG) to measure steady-state visual-evoked potentials (SSVEPs) from disks with quarter segments removed to induce an illusory shape (or rotated to eliminate the illusory square in control trials). Opposing pairs of inducers were tagged with one of two flicker frequencies (2.5 or 4 Hz). During stimulus presentations, participants performed an attention task at fixation that required them to judge the orientation of a briefly flashed central bar while ignoring congruent (same orientation) or incongruent (different orientation) flanker bars that appeared on or off the illusory surface. Importantly, the occurrence of any illusory shape was never task relevant. Frequency-based analyses revealed that SSVEP amplitudes were reliably enhanced for trials in which an illusory square appeared, relative to control trials, at 4, 5 and 8 Hz and at an intermodulation frequency of 13 Hz. Participants' reaction times in the flanker task were significantly slower for incongruent versus congruent trials, and this distractor interference effect occurred only in the presence of an illusory surface and not in the control condition. Our results reveal a robust neural correlate of modal completion in the human visual system and provide evidence that visual completion can affect attentional control processes as deployed in a flanker task. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在自然观察条件下，视觉刺激通常通过闭塞表面来遮挡。为了辅助对象识别，视觉系统主动地重建缺失的信息，如在经典的kanizsa错觉中所例中的，这是称为“模态完成”的现象。猴子中的单细胞录音表明，早期视觉皮质中的神经元对虚幻轮廓反应，但已经证明难以测量人类的模态完成的神经相关性。我们使用脑电图（EEG）来测量稳态的视觉诱发电位（SSVEPS）从分离的圆盘移除，以引起虚幻形状（或旋转以消除控制试验中的虚幻广场）。用两个闪烁频率（2.5或4 Hz）中的一种标记相反的诱导剂。在刺激演示期间，参与者在固定中进行了注意力任务，以便他们要求它们判断短暂闪烁的中心杆的方向，同时忽略出现在幻觉表面上或外面的一致（相同的方向）或不一致（不同的方向）侧翼。重要的是，任何虚幻形状的发生永远不会有关。基于频率的分析表明，对于Illusory广场，相对于对照试验，4,5和8Hz，在13Hz的互调频率下，SSVEP振积可靠地增强了SSVEP振幅。对于不协调的同性试验，参与者在Flanker任务中的反应时间显着较慢，并且这种分散的干扰效应仅发生在虚幻表面而不是控制条件下。我们的结果揭示了人类视觉系统中的模态完成的强大神经相关性，并提供了可视完成可以影响在侧翼任务中部署的注意力控制过程。 （c）2019年elestvier有限公司保留所有权利。

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