The posterior parietal cortex processes visuo-spatial and extra-retinal information for saccadic remapping: A case study

The posterior parietal cortex processes visuo-spatial and extra-retinal information for saccadic remapping: A case study
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后顶叶皮层处理视觉空间和视网膜外信息以进行扫视重映射:案例研究

DOI:
10.1016/j.cortex.2021.02.026
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发表时间:
2021
期刊:
影响因子:
3.6
通讯作者:
Pélisson
Pélisson
中科院分区:
心理学2区
文献类型:
--
作者:
Cheviet;Pisella;Pélisson

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最佳地收集信息和控制行为需要我们不断地通过眼球运动扫描我们的视觉环境。短暂的视网膜图像和眼球运动的视网膜外信号之间的动态相互作用如何导致我们对视觉稳定性的主观体验仍然是认知神经科学中的一个主要问题。本研究的目的是评估和确定的性质的贡献后顶叶皮层(PPC)的扫视重新映射机制,有助于这种知觉的视觉恒定性。在一个患有PPC病变并在左半野表现为视共济失调而无忽视的患者中,测量了经扫视视觉定位任务中的感知反应。使用了两个感知定位任务,每个都有与没有干预扫视:扫视抑制位移(SSD)任务(奥斯滕多夫,Liebermann,& Ploner,2010)和扫视周围闪光定位(Peri-saccadic flash localization,SSD)任务(齐默尔曼& Lappe,2010)。与一组年龄匹配的健康受试者相比,患者在共济失调(左)半野表现出特定的感知缺陷模式。首先,一个显着的损害发生在静止的眼睛条件,证明了视觉空间编码的改变。第二,在扫视条件下,在两个任务中观察到额外的感知缺陷(沿扫视方向沿着约5°的误差),并且主要在视网膜外信号被认为是关键参与的条件下,揭示了视网膜外信号对扫视大小的持续低估,尽管保持了扫视准确性。这些发现强调了PPC在感知视觉恒定性基础上的扫视重映射过程中的关键作用,并为Ziesche和Hamker(2014)等模型提供了经验证据。
Optimally collecting information and controlling behaviour require that we constantly scan our visual environment through eye movements. How the dynamic interaction between short-lived retinal images and extra-retinal signals of eye motion results in our subjective experience of visual stability remains a major issue in Cognitive Neuroscience. The present study aimed to assess and determine the nature of the contribution of the posterior parietal cortex (PPC) to the saccadic remapping mechanisms which contribute to such perceptual visual constancy. Perceptual responses in transsaccadic visual localization tasks were measured in a patient presenting with a PPC lesion and manifesting optic ataxia in the left hemifield with no neglect. Two perceptual localization tasks, each with versus without an intervening saccade, were used: the saccadic suppression of displacement (SSD) task (Ostendorf, Liebermann, & Ploner, 2010) and the peri-saccadic flash localization (LOC) task (Zimmerman & Lappe, 2010). Compared to a group of age-matched healthy subjects, the patient showed a specific pattern of perceptual deficits in the ataxic (left) hemifield. First, a significant impairment occurred in the stationary eye conditions, attesting for an alteration of visuo-spatial encoding. Second, in the saccade conditions, an additional perceptual deficit (an error of ~5° along the saccade direction) was observed in both tasks and mainly in conditions where extra-retinal signals are thought to be critically involved, revealing a constant underestimation by extra-retinal signals of the saccade size, despite preserved saccade accuracy. These findings highlight a crucial role of the PPC in saccadic remapping processes underlying perceptual visual constancy and provide empirical evidence for models such as Ziesche and Hamker’s (2014).
视觉记忆任务中空间重映射和扫视控制的差异顶叶激活
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半去皮质后的动眼神经控制:单个半球编码双侧眼跳的伴随放电
DOI: --
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影响因子: 3.6
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