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首页> 外文期刊>The European Journal of Neuroscience >Centre-surround interactions in response to natural scene stimulation in the primary visual cortex.
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Centre-surround interactions in response to natural scene stimulation in the primary visual cortex.

机译:中心周围的相互作用,以响应初级视觉皮层中的自然场景刺激。

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摘要

Centre-surround interaction in the primary visual cortex (area V1) has been studied extensively using artificial, abstract stimulus patterns, such as bars, gratings and simple texture patterns. In this experiment, we extend the study of centre-surround interaction by using natural scene images. We systematically varied the contrast of natural image surrounds presented outside the classical receptive field (CRF), and recorded neuronal response to a natural image patch presented within the CRF in area V1 of awake, fixating macaques. For the majority of neurons (67 out of 111), the natural image surrounds profoundly modulated, mainly by suppressing, neuronal responses to CRF images. These modulatory effects started at the earliest stage of neuronal responses, and often depended on the contrast and higher-order structures of the surrounds. For 47 out of 67 neurons, randomising the phases of the Fourier spectrum of the natural image surround diminished the centre-surround interaction. Our results suggest that the centre-surround interaction in area V1 can be extended to natural vision, and is sensitive to the higher-order structures of natural scene images, such as image contours.
机译:初级视觉皮层(区域V1)中的中心-周围互动已使用人造的抽象刺激图案(如条形,光栅和简单纹理图案)进行了广泛研究。在本实验中,我们通过使用自然场景图像扩展了中心-周围交互作用的研究。我们系统地改变了在经典感受野(CRF)之外呈现的自然图像周围的对比度,并记录了在清醒的V1区固定在猕猴中的CRF中呈现的自然图像斑块的神经元反应。对于大多数神经元(111个中的67个),自然图像主要通过抑制对CRF图像的神经元响应来进行深度调制。这些调节作用始于神经元反应的最早阶段,通常取决于周围环境的对比度和高阶结构。对于67个神经元中的47个,自然图像周围的傅立叶光谱的相位随机化会减少中心-周围的相互作用。我们的结果表明,区域V1中的中心-周围交互作用可以扩展到自然视觉,并且对自然场景图像的高阶结构(例如图像轮廓)敏感。

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