Davida's deficits: weak encoding of impoverished stimuli or faulty egocentric representation?

Davida's deficits: weak encoding of impoverished stimuli or faulty egocentric representation?
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DOI:
10.1080/02643294.2022.2083947
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发表时间:
2022-03
影响因子:
3.4
通讯作者:
Pasupathy, Anitha
Pasupathy, Anitha
中科院分区:
心理学2区
文献类型:
--
作者:
Popovkina, Dina V.;Pasupathy, Anitha

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Vannuscorps及其同事报告了一个不寻常的案例,一位年轻女性患有特定的感知缺陷:由尖锐或高对比度边界和线条画定义的2D刺激似乎缺乏稳定的全局方向。Davida以几种系统的方式误报了这些物体的方向,包括从真实方向偏移90*,180* 或270* 的方向,以及跨主轴的反射。这种知觉缺陷不存在于低对比度或模糊刺激,或通过添加其他线索,如第三维。与无法做出准确的全局方向判断相反,大卫达的许多其他感知判断是完整的:例如,大小判断,全局形状识别和物体内部子部分的相对方向。作者认为,这种特定的破坏来自于小细胞通路对视网膜定位和以形状为中心的坐标重新映射到行为相关的身体和世界为中心的坐标的贡献。
Vannuscorps and colleagues report an unusual case of a young woman with a specific perceptual deficit: 2D stimuli defined by sharp or high-contrast boundaries and line drawings appear to lack a stable global orientation. Davida misreports the orientation of such objects in several systematic ways, including orientations offset by 90*, 180* or 270* from the veridical, and reflections across major axes. This perceptual deficit is not present for lower contrast or blurred stimuli, or by the addition of other cues such as a third dimension. In contrast to the inability to make accurate global orientation judgments, many of Davida’s other perceptual judgments are intact: for example, size judgments, global shape identification, and relative orientation of subparts within an object. The authors posit that the specific disruption arises from the parvocellular pathway’s contribution to the remapping of retinotopic and shape-centered coordinates onto behaviorally relevant body- and world-centered coordinates.
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