Ventura J
J Exp Psychol Hum Percept Perform. 1980 Aug;6(3):473-85. doi: 10.1037//0096-1523.6.3.473.
Strong metacontrast was found during experiments involving foveal presentation of stimuli. Follow-up experiments indicate that foveal metacontrast can be accounted for in some conditions by a practice effect and/or a criterion-content change, which occurs with practice and involves a biphasic brightness response to the target. Consideration of these factors may help resolve some of the many apparent disparities in the metacontrast literature. The relevance of these factors to metacontrast theories is discussed.
在涉及中央凹呈现刺激的实验中发现了强烈的元对比。后续实验表明，在某些情况下，中央凹元对比可以通过练习效应和/或标准内容变化来解释，这种变化随着练习而发生，并且涉及对目标的双相亮度反应。考虑这些因素可能有助于解决元对比文献中许多明显的差异。讨论了这些因素与元对比理论的相关性。
