Boon Mei Ying, Suttle Catherine M, Henry Bruce
School of Optometry and Vision Science, University of New South Wales, Sydney NSW 2052, Australia.
Vision Res. 2005 Aug;45(18):2367-83. doi: 10.1016/j.visres.2005.02.017. Epub 2005 Mar 29.
Chromatic contrast thresholds may be estimated from transient VEPs by measuring the peak-to-peak amplitude at a range of stimulus levels followed by extrapolation to zero amplitude. However, there have been reports of failure of this technique when applied to the transient chromatic VEP due to variability of amplitude, difficulties with component identification and poor correlation of amplitude with stimulus level. The aim of our study was to compare methods of transient VEP chromatic contrast threshold estimation in terms of success rate and comparison with psychophysical threshold. We found each of the methods we investigated to have a high success rate, and in most cases VEP and psychophysical thresholds did not differ significantly.
通过测量一系列刺激水平下的峰峰值振幅，然后外推至零振幅，可以从瞬态视觉诱发电位（VEP）估计色对比度阈值。然而，有报告称，由于振幅的变异性、成分识别困难以及振幅与刺激水平的相关性较差，该技术应用于瞬态色觉VEP时会失败。我们研究的目的是在成功率以及与心理物理学阈值比较方面，比较瞬态VEP色对比度阈值估计的方法。我们发现，我们研究的每种方法都有很高的成功率，并且在大多数情况下，VEP阈值和心理物理学阈值没有显著差异。
