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Investigating Category- and Shape-Selective Neural Processing in Ventral and Dorsal Visual Stream Under Interocular Suppression

机译：研究眼底压迫下腹侧和背侧视觉流中的类别和形状选择神经处理

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Recent behavioral and neuroimaging studies using continuous flash suppression (CFS) have suggested that action-related processing in the dorsal visual stream might be independent of perceptual awareness, in line with the vision-for-perception versus vision-for-action distinction of the influential dual-stream theory. It remains controversial if evidence suggesting exclusive dorsal stream processing of tool stimuli under CFS can be explained by their elongated shape alone or by action-relevant category representations in dorsal visual cortex. To approach this question, we investigated category- and shape-selective functional magnetic resonance imaging-blood-oxygen level-dependent responses in both visual streams using images of faces and tools. Multivariate pattern analysis showed enhanced decoding of elongated relative to non-elongated tools, both in the ventral and dorsal visual stream. The second aim of our study was to investigate whether the depth of interocular suppression might differentially affect processing in dorsal and ventral areas. However, parametric modulation of suppression depth by varying the CFS mask contrast did not yield any evidence for differential modulation of category-selective activity. Together, our data provide evidence for shape-selective processing under CFS in both dorsal and ventral stream areas and, therefore, do not support the notion that dorsal vision-for-action processing is exclusively preserved under interocular suppression. Hum Brain Mapp,36:137-149, 2015. (c) 2014 Wiley Periodicals, Inc.
机译：最近使用连续闪光抑制（CFS）进行的行为和神经影像学研究表明，背侧视觉流中与动作相关的处理可能独立于感知意识，这与有影响力的视觉感知与动作感知的区分是一致的双流理论。是否有证据表明在CFS下对工具刺激进行独家背流处理的证据可以通过其单独的拉长形状或在背侧视觉皮层中的与动作相关的类别表示来解释。为了解决这个问题，我们研究了使用脸部和工具图像在视觉流中的类别和形状选择性功能磁共振成像-血氧水平依赖性响应。多元模式分析显示，相对于非拉长工具，无论在腹侧和背侧视觉流中，对拉长工具的解码效果均得到增强。我们研究的第二个目的是研究眼内抑制的深度是否会不同地影响背侧和腹侧区域的加工。但是，通过改变CFS掩模对比度来抑制深度的参数调制并不能提供任何有关类别选择性活动的差分调制的证据。在一起，我们的数据提供了在CFS下在背侧和腹侧流区域进行形状选择处理的证据，因此，不支持以下观点：行动性背视视觉处理仅在眼内压制下得以保留。嗡嗡的大脑Mapp，36：137-149，2015年。（c）2014 Wiley Periodicals，Inc.

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