A Neural Model of Distance-Dependent Percept of Object Size Constancy.
A Neural Model of Distance-Dependent Percept of Object Size Constancy.
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DOI：
10.1371/journal.pone.0129377
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Yazdanbakhsh A
中科院分区：
文献类型：
--
作者：
Qian J;Yazdanbakhsh A
尺寸恒定性是众所周知的视觉现象之一，它表现出感知稳定性，以解释观看距离对视网膜图像尺寸的影响。尽管基于心理物理学研究的涉及距离缩放以实现尺寸恒定性的理论已经蓬勃发展，但其潜在的神经机制仍然未知。单细胞记录显示，距离依赖性大小调谐细胞在腹侧流中很常见，源自 V1、V2 和 V4，通向 IT。此外，最近采用功能磁共振成像的研究表明，物体的感知大小与其感知的自我中心距离相关，调节其在 V1 中的视网膜专题表征。这些结果表明，V1 有助于大小恒定，其活动可能受到来自其他大脑区域的距离信息反馈的调节。在这里，我们根据这些发现提出了一个神经模型。首先，我们通过增益调制 MT 神经元整合水平视差和聚散度，在 LIP 中构建以自我为中心的距离图。其次，LIP 神经元将距离信息的调节反馈发送到 V1 中大小调整的细胞，从而导致 V1 皮质活动的扩散。这个过程为 V1 提供了与距离相关的尺寸表示。该模型支持通过缩放视网膜图像尺寸来补偿感知距离的变化来保持尺寸恒定性，并提出了一种能够实现该过程的可能的神经电路。
Size constancy is one of the well-known visual phenomena that demonstrates perceptual stability to account for the effect of viewing distance on retinal image size. Although theories involving distance scaling to achieve size constancy have flourished based on psychophysical studies, its underlying neural mechanisms remain unknown. Single cell recordings show that distance-dependent size tuned cells are common along the ventral stream, originating from V1, V2, and V4 leading to IT. In addition, recent research employing fMRI demonstrates that an object’s perceived size, associated with its perceived egocentric distance, modulates its retinotopic representation in V1. These results suggest that V1 contributes to size constancy, and its activity is possibly regulated by feedback of distance information from other brain areas. Here, we propose a neural model based on these findings. First, we construct an egocentric distance map in LIP by integrating horizontal disparity and vergence through gain-modulated MT neurons. Second, LIP neurons send modulatory feedback of distance information to size tuned cells in V1, resulting in a spread of V1 cortical activity. This process provides V1 with distance-dependent size representations. The model supports that size constancy is preserved by scaling retinal image size to compensate for changes in perceived distance, and suggests a possible neural circuit capable of implementing this process.
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影响因子：
64.8
作者：
Gamlin, PD;Yoon, K
通讯作者：
Yoon, K
影响因子：
56.9
作者：
Dobbins, AC;Jeo, RM;Allman, JM
通讯作者：
Allman, JM
影响因子：
22.4
作者：
EPSTEIN, W;PARK, J;CASEY, A
通讯作者：
CASEY, A
DOI：
10.1098/rspb.1989.0059
发表时间：
1989-09-22
期刊：
PROCEEDINGS OF THE ROYAL SOCIETY SERIES B-BIOLOGICAL SCIENCES
影响因子：
--
作者：
BISHOP, PO
通讯作者：
BISHOP, PO
影响因子：
2.5
作者：
GNADT, JW;MAYS, LE
通讯作者：
MAYS, LE