The role of apparent size in building- and object-specific regions of ventral visual cortex
The role of apparent size in building- and object-specific regions of ventral visual cortex
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DOI：
10.1016/j.brainres.2011.02.022
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发表时间：
2011-05-04
期刊：
影响因子：
2.9
通讯作者：
Koehler, Stefan
中科院分区：
文献类型：
--
作者：
Cate, Anthony D.;Goodale, Melvyn A.;Koehler, Stefan
研究发现，建筑物和可操纵物体的图像会激活腹侧视觉通路中的不同区域。然而，许多非分类属性将建筑物与普通的日常物品区分开来，其中最突出的可能是尺寸。在这项功能磁共振成像研究中，我们调查了感知尺度的变化是否可以解释某些类别特异性反应的差异，独立于语义或视网膜图像属性的影响。我们使用独立的扫描定位对象特定的ROI在外侧枕叶皮质（LO）和场景特定的ROI在海马旁位置区（PPA）和后副沟。然后，我们在析因设计中对比了这些区域中刺激类别和感知大小/距离的影响。参与者进行了一个古怪的检测任务，同时查看对象，建筑物和平面矩形的图像，有和没有一个背景，通过简单的图形提示，指示刺激的大小/距离。功能磁共振成像反应的分析表明，除了类别的影响，在LO和PPA的感知大小/距离的影响。有趣的是，当简单的矩形在控制条件下呈现在显示大小/距离的背景下时，右半球的LO对小/近矩形的反应明显比对大/远矩形的反应更大，尽管矩形本身是相同的。这些发现表明，腹侧流区域，显示类别特异性调制的视觉刺激的感知大小和距离。(C)2011 Elsevier B. V.保留所有权利。
Images of buildings and manipulable objects have been found to activate distinct regions in the ventral visual pathway. Yet, many non-categorical properties distinguish buildings from common everyday objects, and perhaps the most salient of these is size. In this fMRI study, we investigated whether or not changes in perceived scale can account for some of the differences in category-specific responses, independent of the influence of semantic or retinotopic image properties. We used independent scans to localize object-specific ROIs in lateral occipital cortex (LO) and scene-specific ROIs in the parahippocampal place area (PPA) and posterior collateral sulcus. We then contrasted the effects of stimulus category and perceived size/distance in these regions in a factorial design. Participants performed an oddball detection task while viewing images of objects, buildings, and planar rectangles both with and without a background that indicated stimulus size/distance via simple pictorial cues. The analyses of fMRI responses showed effects of perceived size/distance in addition to effects of category in LO and the PPA. Interestingly, when simple rectangles were presented in a control condition against the background that indicated size/distance, LO in the right hemisphere responded significantly more to the small/close rectangles than to the large/far ones, in spite of the fact that the rectangles themselves were identical. These findings suggest that ventral stream regions that show category specificity are modulated by the perceived size and distance of visual stimuli. (C) 2011 Elsevier B.V. All rights reserved.