Tardif Jessica, Watson Marcus R, Giaschi Deborah, Gosselin Frédéric
Département de Psychologie, Université de Montréal, Montréal, QC, Canada.
Department of Biology, York University, Toronto, ON, Canada.
Front Neurosci. 2021 Mar 9;15:626466. doi: 10.3389/fnins.2021.626466. eCollection 2021.
The Campbell-Robson chart is a highly popular figure used in psychophysics and visual perception textbooks to illustrate the Contrast Sensitivity Function (CSF). The chart depicts a grating which varies logarithmically in spatial frequency (SF) from left to right and in contrast from bottom to top. Campbell and Robson's (1964) intuition was that the boundary between the grating and the homogeneous gray area (below threshold) would trace the shape of the observer's own CSF. In this paper, we tested this intuition. A total of 170 participants (96 adults and 74 children) adjusted the four parameters of a truncated log-parabola directly onto a Campbell-Robson chart rendition and completed a gold-standard CSF evaluation. We hoped that this procedure which requires a mere three clicks on the computer mouse, would speed up the measurement of the CSF to under a minute. Unfortunately, the only parameter of the truncated log-parabola fitted to the gold-standard CSF data that could be predicted from the Campbell-Robson chart data was the peak sensitivity for the adult participants. We conclude that the curve visible on the Campbell-Robson chart cannot be used practically to measure the CSF.
坎贝尔 - 罗布森图表是心理物理学和视觉感知教科书中广泛使用的一种图形，用于说明对比敏感度函数（CSF）。该图表描绘了一个光栅，其空间频率（SF）从左到右呈对数变化，对比度从下到上变化。坎贝尔和罗布森（1964年）的直觉是，光栅与均匀灰色区域（低于阈值）之间的边界将描绘出观察者自身CSF的形状。在本文中，我们对这一直觉进行了测试。共有170名参与者（96名成年人和74名儿童）直接在坎贝尔 - 罗布森图表的版本上调整截断对数抛物线的四个参数，并完成了一项金标准CSF评估。我们希望这个只需在电脑鼠标上点击三次的程序，能将CSF的测量速度加快到一分钟以内。不幸的是，从坎贝尔 - 罗布森图表数据中能够预测到的、与金标准CSF数据拟合的截断对数抛物线的唯一参数，是成年参与者的峰值敏感度。我们得出结论，坎贝尔 - 罗布森图表上可见的曲线实际上不能用于测量CSF。
