Population Responses to Contour Integration: Early Encoding of Discrete Elements and Late Perceptual Grouping
Population Responses to Contour Integration: Early Encoding of Discrete Elements and Late Perceptual Grouping
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DOI：
10.1016/j.neuron.2013.02.013
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发表时间：
2013-04-24
期刊：
影响因子：
16.2
通讯作者：
Slovin, Hamutal
中科院分区：
文献类型：
--
作者：
Gilad, Ariel;Meirovithz, Elhanan;Slovin, Hamutal
离散的、相似方向的元素的感知分组背后的神经机制尚不清楚。为了研究这一点，我们使用电压敏感染料成像测量了接受轮廓检测任务训练的猴子 V1 中的神经群体反应。通过将轮廓和背景元素映射到 V1 上，我们可以研究它们的神经处理。早期的群体反应显示出与轮廓/背景单个元素相对应的激活斑块。然而，轮廓元素的后期活动增加以及背景元素的活动受到抑制，使我们能够在单次试验中可视化从抑制的背景中“弹出”的显着连续轮廓。轮廓和背景中的这种调制活动超出了单个轮廓或背景元素的皮质表示。最后，后期调节与轮廓显着性的行为表现和猴子的感知报告相关。因此，轮廓和背景中的相反反应可能是 V1 中感知分组的基础。
The neuronal mechanisms underlying perceptual grouping of discrete, similarly oriented elements are not well understood. To investigate this, we measured neural population responses using voltage-sensitive dye imaging in V1 of monkeys trained on a contour-detection task. By mapping the contour and background elements onto V1, we could study their neural processing. Population response early in time showed activation patches corresponding to the contour/background individual elements. However, late increased activity in the contour elements, along with suppressed activity in the background elements, enabled us to visualize in single trials a salient continuous contour "popping out" from a suppressed background. This modulated activity in the contour and in background extended beyond the cortical representation of individual contour or background elements. Finally, the late modulation was correlated with behavioral performance of contour saliency and the monkeys' perceptual report. Thus, opposing responses in the contour and background may underlie perceptual grouping in V1.