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首页> 外文期刊>The European Journal of Neuroscience >Changes of effective connectivity between the lateral and medial parts of the prefrontal cortex during a visual task.
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Changes of effective connectivity between the lateral and medial parts of the prefrontal cortex during a visual task.

机译：视觉任务期间前额叶皮层外侧和内侧部分之间有效连接的变化。

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Structural equation modelling was used to study the change of connectivity during a visual task with continuous variation of the attention load. The model was based on areas defined by the haemodynamic responses described elsewhere [Mazoyer, P., Wicker, B. & Fonlupt, P. (2002) A neural network elicited by parametric manipulation of the attention load. Neuroreport, 13, 2331-2334], including occipitotemporal, parietal, temporal and prefrontal (lateral and medial areas) cortices. We have studied stationary- (which does not depend on the attentional load) and attention-related coupling between areas. This allowed the segregation of two subsystems. The first could reflect a system performing the integration step of the visual signal and the second a system participating in response selection. The major finding is the mutual negative influence between the lateral and medial parts of the prefrontal cortex. This negative influence between these two brain regions increased with the attention load. This is interpreted as a modification of the balance between integration and decision processes that are needed for the task to be efficiently completed.
机译：结构方程模型用于研究在视觉任务中，注意力负荷连续变化的连通性变化。该模型基于在其他地方[Mazoyer，P.，Wicker，B.＆Fonlupt，P.（2002）通过注意负荷的参数操纵引起的神经网络”所描述的血液动力学响应所定义的区域。 Neuroreport，13，2331-2334]，包括枕颞叶，顶叶，颞叶和前额叶（外侧和内侧区域）皮层。我们已经研究了固定区域（不取决于注意力负荷）和区域之间与注意力相关的耦合。这允许两个子系统分离。第一个可以反映执行视觉信号积分步骤的系统，第二个可以反映参与响应选择的系统。主要发现是前额叶皮层的外侧和内侧部分之间的相互负面影响。这两个大脑区域之间的负面影响随着注意力负荷的增加而增加。这被解释为整合和决策过程之间平衡的修改，这是有效完成任务所需的。

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