Unconscious processing dissociates along categorical lines
Unconscious processing dissociates along categorical lines
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DOI：
10.1073/pnas.0805867105
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发表时间：
2008-09-30
影响因子：
11.1
通讯作者：
Caramazza, Alfonso
中科院分区：
文献类型：
--
作者：
Almeida, Jorge;Mahon, Bradford Z.;Caramazza, Alfonso
视觉目标识别由大脑的腹侧、颞叶和枕叶区域提供辅助。组成背侧视觉通路的区域并不被认为与物体识别相关，尽管这些区域对工具相关信息存在强烈的分类偏见。这里，我们展示了背流过程对物体分类的影响。我们使用了两种技术来呈现优质图片：连续闪光抑制(CFS)和后向掩蔽(BM)。连续闪光抑制(CFS)消除了进入腹侧颞区的输入，但背侧流过程基本不受影响；向后掩蔽(BM)允许被抑制的信息同时到达腹侧和背侧流结构。在CFS下抑制的绝对同余素数有助于工具的分类，但对不可操作的对象没有影响；相反，通过BM呈现的不可见的素数有助于工具和不可操作的对象的目标分类。我们的发现表明，背向流计算的信息用于对象分类，但仅用于一类可操作对象。
Visual object recognition is subserved by ventral temporal and occipital regions of the brain. Regions comprising the dorsal visual pathway have not been considered relevant for object recognition, despite strong categorical biases for tool-related information in those regions. Here, we show that dorsal stream processes influence object categorization. We used two techniques to render prime pictures invisible: continuous flash suppression ( CFS), which obliterates input into ventral temporal regions, but leaves dorsal stream processes largely unaffected, and backward masking ( BM), which allows suppressed information to reach both ventral and dorsal stream structures. Categorically congruent primes suppressed under CFS facilitate categorization of tools but have no effect on nonmanipulable objects; in contrast, primes rendered invisible through BM facilitate target categorization for both tools and nonmanipulable things. Our findings demonstrate that information computed by the dorsal stream is used in object categorization, but only for a category of manipulable objects.