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首页> 外文期刊>The European Journal of Neuroscience >Color responses of the human lateral geniculate nucleus: selective amplification of S-cone signals between the lateral geniculate nucleno and primary visual cortex measured with high-field fMRI.
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Color responses of the human lateral geniculate nucleus: selective amplification of S-cone signals between the lateral geniculate nucleno and primary visual cortex measured with high-field fMRI.

机译：人类外侧膝状核的颜色响应：用高场fMRI测量，在外侧膝状核和初级视觉皮层之间选择性扩增S-cone信号。

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摘要

The lateral geniculate nucleus (LGN) is the primary thalamic nucleus that relays visual information from the retina to the primary visual cortex (V1) and has been extensively studied in non-human primates. A key feature of the LGN is the segregation of retinal inputs into different cellular layers characterized by their differential responses to red-green (RG) color (L/M opponent), blue-yellow (BY) color (S-cone opponent) and achromatic (Ach) contrast. In this study we use high-field functional magnetic resonance imaging (4 tesla, 3.6 x 3.6 x 3 mm(3)) to record simultaneously the responses of the human LGN and V1 to chromatic and Ach contrast to investigate the LGN responses to color, and how these are modified as information transfers between LGN and cortex. We find that the LGN has a robust response to RG color contrast, equal to or greater than the Ach response, but a significantly poorer sensitivity to BY contrast. In V1 at low temporal rates (2 Hz), however, the sensitivity of the BY color pathwayis selectively enhanced, rising in relation to the RG and Ach responses. We find that this effect generalizes across different stimulus contrasts and spatial stimuli (1-d and 2-d patterns), but is selective for temporal frequency, as it is not found for stimuli at 8 Hz. While the mechanism of this cortical enhancement of BY color vision and its dynamic component is unknown, its role may be to compensate for a weak BY signal originating from the sparse distribution of neurons in the retina and LGN.
机译：外侧膝状体核（LGN）是将丘脑的视觉信息从视网膜传递到初级视皮层（V1）的主要丘脑核，并且已在非人类灵长类动物中进行了广泛研究。 LGN的主要特征是将视网膜输入信号分为不同的细胞层，其特征在于它们对红绿色（RG）颜色（L / M对手），蓝黄色（BY）颜色（S锥对手）和消色差（Ach）对比度。在这项研究中，我们使用高场功能磁共振成像（4 tesla，3.6 x 3.6 x 3 mm（3））来同时记录人类LGN和V1对色度和Ach对比度的响应，以研究LGN对颜色的响应，以及如何将其修改为LGN和皮质之间的信息传递。我们发现，LGN对RG色彩对比度具有强大的响应能力，等于或大于Ach响应，但对BY对比度的敏感性明显较差。但是，在低时间速率（2 Hz）的V1中，BY色通路的灵敏度有选择地提高，与RG和Ach响应有关。我们发现，这种效应普遍存在于不同的刺激对比和空间刺激（1-d和2-d模式）中，但对时间频率具有选择性，因为未发现8 Hz的刺激。虽然尚不清楚BY色视觉及其动态成分的皮质增强机制，但其作用可能是补偿源自视网膜和LGN中神经元稀疏分布的弱BY信号。

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