Adachi-Usami E
Jpn J Physiol. 1978;28(2):171-80. doi: 10.2170/jjphysiol.28.171.
Scotopic properties of the peripheral retina in man was studied by recording visually evoked cortical potentials (VECPs). The intensity required for a criterion latency of the scotopic VECP was compared with the sensory threshold in a number of situations where the stimulating retinal site and the area of the stimulus were altered. With circular spot stimulation, the VECT amplitude attenuated greatly as the stimulus site moved to peripheral 10 degrees and was almost null when stimulation was made outside it. However, within the retinal area from the fovea to peripheral 10 degrees, the VECP sensitivity was found to vary according to the rod distribution, as suggested from the sensory threshold. Stimulation with annular patterns revealed that the parallelism between the VECP sensitivity and the rod distribution holds good within up to 30 degrees from the fovea. A strong summation was proved to be operative for eliciting VECPs by stimulation of the peripheral retina.
通过记录视觉诱发电位（VECP）研究了人类周边视网膜的暗视特性。在刺激视网膜部位和刺激区域发生改变的多种情况下，将暗视VECP标准潜伏期所需的强度与感觉阈值进行了比较。采用圆形光斑刺激时，随着刺激部位移至周边10度，VECT幅度大幅衰减，当在其外进行刺激时几乎为零。然而，在从中央凹到周边10度的视网膜区域内，发现VECP敏感性根据视杆分布而变化，这与感觉阈值所提示的情况一致。采用环形图案刺激表明，在距中央凹30度范围内，VECP敏感性与视杆分布之间的平行关系依然成立。事实证明，通过刺激周边视网膜来诱发VECP时存在强烈的总和作用。
