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首页> 外文期刊>Journal of Neurophysiology >Surround suppression in primate V1.
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Surround suppression in primate V1.

机译：灵长类动物V1中的环绕声抑制。

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We investigated the spatial organization of surround suppression in primate primary visual cortex (V1). We utilized drifting stimuli, configured to extend either from within the classical receptive field (CRF) to surrounding visual space, or from surrounding visual space into the CRF or subdivided to generate direction contrast, to make a detailed examination of the strength, spatial organization, direction dependence, mechanisms, and laminar distribution of surround suppression. Most cells (99/105, 94%) through all cortical layers, exhibited suppression (mean reduction 67%) to uniform stimuli exceeding the CRF, and 43% exhibited a more than 70% reduction. Testing with an annulus revealed two different patterns of surround influence. Some cells (37% of cells), classical surround suppression (CSS) cells exhibited responses to an annulus encroaching on the CRF that were less than the plateau in the spatial summation curve. The majority (63%), center-gated surround suppression (CGSS) cells, showed responses to annuli that equaled or exceeded the plateau in the spatial summation curve. Analysis suggested the CSS mechanism was implemented in all cells while the CGSS mechanism was implemented in varying strength across the sample with the extreme reflected in cells that gave larger responses to annuli than to a center stimulus. Reversing the direction of motion of the portion of the stimulus surrounding the CRF revealed four different patterns of effect: no reduction in the degree of suppression (22% of cells), a reduction in surround suppression (41%), a facilitation of the response above the level to the inner stimulus alone (37%), and a facilitation of the response above that to the inner stimulus alone that also exceeded the values associated with an optimal inner stimulus. The facilitatory effects were only seen for reverse direction interfaces between the central and surrounding stimulus at diameters equal to or more than the CRF size. The zones driving the suppressive influences and the direction contrast facilitation were often spatially heterogeneous and for a number of cells bore strong comparison with the class of behavior reported for surround mechanisms in MT. This suggests a potential role, for example, in extracting information about motion contrast in the representation of the three dimensional structure of moving objects.
机译：我们调查了灵长类动物初级视觉皮层（V1）中周围抑制的空间组织。我们利用了漂移刺激，将其配置为从经典感受野（CRF）范围内扩展到周围的视觉空间，或者从周围的视觉空间扩展到CRF内，或者细分为产生方向对比，从而对强度，空间组织，方向依赖性，机理和环绕声抑制的层状分布。贯穿所有皮质层的大多数细胞（99/105，94％）均表现出抑制作用（平均减少67％），超过了CRF的均匀刺激，而43％的表现出超过70％的减少。用环的测试显示了两种不同的环绕影响模式。一些细胞（占细胞的37％）是经典的环绕抑制（CSS）细胞，其对CRF环隙的反应小于空间求和曲线中的平稳期。大多数（63％）的中心门控环绕声抑制（CGSS）细胞在空间总和曲线中显示出对等于或超过高原的环的响应。分析表明，在所有细胞中均实施了CSS机制，而在整个样本中以不同强度实施了CGSS机制，其中极端现象反映在对环比对中心刺激更大的细胞中。逆转CRF周围刺激部分的运动方向显示出四种不同的作用模式：抑制程度没有降低（22％的细胞），周围抑制的降低（41％），促进了反应高于仅对内部刺激的水平（37％），并且高于对单独内部刺激的响应的响应也超过了与最佳内部刺激相关的值。仅在直径等于或大于CRF大小的中央刺激物和周围刺激物之间的反向界面上看到促进作用。驱动抑制影响和方向对比促进作用的区域通常在空间上是异质的，并且对于许多细胞而言，与报道的MT环绕机制的行为类别具有很强的比较性。这表明了潜在的作用，例如，在提取运动对象三维结构表示中的运动对比度信息时。

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