偏心率对多焦视觉诱发电位（mfVEPs）对比反应函数的影响。
The effect of eccentricity on the contrast response function of multifocal visual evoked potentials (mfVEPs).
作者信息
Laron Michal, Cheng Han, Zhang Bin, Frishman Laura J
机构信息
College of Optometry, University of Houston, 505 J Davis Armistead Bldg, Houston, TX 77204-2020, USA.
出版信息
Vision Res. 2009 Jul;49(14):1711-6. doi: 10.1016/j.visres.2009.03.021. Epub 2009 Mar 31.
Abstract
mfVEPs were recorded with a 22 degrees radius, 60 sector pattern reversal dartboard stimulus (VERIS) at six contrast levels (10%, 25%, 35%, 50%, 75%, 95%). Contrast response functions (CRFs) based on response amplitudes were adequately described by a simple hyperbolic function. The effect of reducing contrast on the amplitude was most apparent in the central 1 degrees radius, which had a C(50) (contrast at 50% of the maximum response) in excess of 50%, compared to values for C(50) in more eccentric regions that were 30% or lower. Mean latency increased 6 (+/-0.7 SE) ms from the highest to the lowest contrast tested, and did not vary significantly with eccentricity.
摘要
使用半径为22度、60扇区模式反转飞镖盘刺激（VERIS）在六个对比度水平（10%、25%、35%、50%、75%、95%）下记录多焦视觉诱发电位（mfVEPs）。基于反应幅度的对比度反应函数（CRFs）可用一个简单的双曲线函数充分描述。对比度降低对幅度的影响在中央1度半径区域最为明显，该区域的C(50)（最大反应的50%时的对比度）超过50%，相比之下，更偏心区域的C(50)值为30%或更低。平均潜伏期从测试的最高对比度到最低对比度增加了6（±0.7标准误）毫秒，且不随偏心度显著变化。
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