Synaptic and structural parameters in the microcircuit.

Each of the nine connection types (which can be grouped as indicated) is characterized by a specific connection density, weight and delay. In the homogeneous condition, weights and delays are fixed and equal to the mean values (, ) for all synapses of a given type, whereas in the heterogeneous condition they are independently drawn from lognormal distributions with the corresponding mean and standard deviation. The last two rows in the table are the connection-specific structural bias parameters, used to skew the network’s degree and weight distributions. The indicated values were taken directly from [110] and [71]. The cases marked with—or x, correspond to connections that were either tested, revealing no significant effect (-) or untested due to missing data (x). In both cases, we set the corresponding values to 0.

九种连接类型（可按标注方式分组）各自具有特定的连接密度、权重与延迟特性。在同质性条件下，给定类型的所有突触（synapse）的权重与延迟均为固定值，等于其对应均值（原文此处括号留空）；而在异质性条件下，权重与延迟则分别从具有对应均值和标准差的对数正态分布（lognormal distribution）中独立采样得到。表格最后两列为针对特定连接类型的结构偏置参数，用于调整网络的节点度分布与权重分布。表中标注的数值直接取自文献[110]与[71]。标注有短横线（-）或叉号（x）的条目，分别对应两类连接：经测试未发现显著效应的连接（-），以及因数据缺失而未开展测试的连接（x）。针对这两类情况，我们均将其对应参数值设为0。