Lachapelle P, Molotchnikoff S
Can J Ophthalmol. 1986 Feb;21(1):19-22.
The impact of the 60 Hz notch (rejection) filter was examined in typical photopic electroretinograms recorded with two different bandwidths: 1-1000 Hz and 100-1000 Hz. The peak times of the major ERG components (a- and b-waves) are not modified by the line filter. The amplitude of the b-wave decreases by 30%, and the morphology of the ERG wave changes slightly. Segmental analysis of the ascending limb of the b-wave reveals that the sole reduction in the amplitude of its first step (from the a-wave trough to the peak of the first oscillatory potential) accounts for more than 70% of the overall reduction measured for the b-wave. Similar results are also found in ERGs recorded with the 100-1000 Hz bandwidth. The data suggests that the b-wave of the ERG should be considered as a composite of potentials rather than as a single potential.
在使用1-1000Hz和100-1000Hz两种不同带宽记录的典型明视视网膜电图中，研究了60Hz陷波（抑制）滤波器的影响。主要视网膜电图成分（a波和b波）的峰值时间不受线路滤波器的影响。b波的振幅降低了30%，视网膜电图波的形态略有变化。对b波上升支的分段分析表明，其第一步（从a波谷到第一个振荡电位峰值）振幅的唯一降低占b波总体降低量的70%以上。在使用100-1000Hz带宽记录的视网膜电图中也发现了类似结果。数据表明，视网膜电图的b波应被视为多种电位的复合体，而非单一电位。
