Neuronal connection in the LGN and the function of the centrifugal optic nerve fiber

研究了猫后外侧上脑皮层皮层（LS）皮质皮质（CT）和皮质纹状体（CS）神经元的反应特性。虽然LS中的CT和CS神经元具有许多相同的响应特性，但显然存在一些差异，例如速度调谐，接受野大小和方向选择性。这种差异与这两种途径的解剖分离是一致的。此外，为了阐明听觉选择性注意对视觉系统的影响，在给予和不给予听觉任务的情况下，同时记录模式视网膜电图（PERG）和模式视觉皮层诱发电位（PVECP）。选择性听觉注意导致PERG的P1和N2波幅均降低。采用相同的方法，分析另一只眼在暗适应和光适应后的强直性眼间抑制（TIS）。在暗适应过程中，PERG和pecp的振幅瞬间下降。光适应后，PERG和pecp的振幅瞬间升高。这些结果表明，在人类中，听觉选择性注意和TIS的神经元机制至少部分可归因于视网膜起源，因为PERG主要反映包括视网膜神经节细胞在内的视网膜活动。离心式视神经纤维可能参与了这一机制。

The responses properties of corticotectal (CT) and corticostriatal (CS) neurons in the posterior lateral suprasylvian cortex (LS) of the cat were examined. While CT and CS neurons in LS share many of the same response properties, there are, apparently, differences such as velocity tuning, receptive field size and direction selectivity. Such differences are consistent with the anatonical segregation of these two pathways.Furthermore, to elucidate the influence of auditory selective attention upon the visual system, simultaneous recordiuags of pattern electroretinogram (PERG) and pattern visual evoked cortical potential (PVECP) were conducted when auditory task was give nor not. Selective auditory attention resulted in the reduction of both P1 auad N2 amplitudes of PERG.Using same procedure, tonic interocular suppression (TIS) was analyzed during dark adaptation or after light adaptation of the other eye. During dark adaptation, amplitudes of PERG and PVECP were decreased transiently. In contrast, amplitudes of PERG and PVECP were increased transiently after the light adaptation. These results suggest that in human, neuronal mechanizm of auditory selective attention as well as of TIS is, at least in part, attributable to retinal origin since PERG mainly reflects the retinal activities includung the retinal ganglion cells. Postulated centrifugal optic nerve fiber may be involved in this mechanizm.