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Sparse representation of global features of visual images in human primary visual cortex: Evidence from fMRI

机译：人类初级视觉皮层中视觉图像整体特征的稀疏表示：来自fMRI的证据

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In fMRI experiments on object representation in visual cortex, we designed two types of stimuli: one is the gray face image and its line drawing, and the other is the illusion and its corresponding completed illusion. Both of them have the same global features with different minute details so that the results of fMRI experiments can be compared with each other. The first kind of visual stimuli was used in a block design fMRI experiment, and the second was used in an event-related fMRI experiment. Comparing and analyzing interesting visual cortex activity patterns and blood oxygenation level dependent (BOLD)fMRI signal, we obtained results to show some invariance of global features of visual images. A plausible explanation about the invariant mechanism is related with the cooperation of synchronized response to the global features of the visual image with a feedback of shape perception from higher cortex to cortex V1, namely the integration of global features and embodiment of sparse representation and distributed population code.
机译：在功能磁共振成像实验中，视觉皮层中对象表示的设计中，我们设计了两种类型的刺激：一种是灰色面部图像及其线条图，另一种是幻觉及其相应的完整幻觉。两者具有相同的全局特征，但具有不同的分钟细节，因此可以将fMRI实验的结果相互比较。第一种视觉刺激用于块设计fMRI实验中，第二种视觉刺激用于事件相关性fMRI实验中。比较和分析有趣的视觉皮层活动模式和血液氧合水平依赖性（BOLD）fMRI信号，我们获得的结果表明视觉图像的整体特征有些不变。关于不变机制的一个合理解释与对视觉图像全局特征的同步响应与从高级皮质到皮质V1的形状感知反馈的协作（即全局特征的集成以及稀疏表示和分布总体的体现）的协作有关。码。

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