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. 2018 Jan 23;9:8. doi: 10.3389/fpsyg.2018.00008

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Copyright © 2018 Reeves, Grayhem and Hwang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Plots of rod thresholds for detecting a larger target (1.3°), either on a steady field (Ton) or 600 ms (Toff) or 200 ms (Toff-flash) in darkness. Thresholds were averaged over three observers and are plotted as a function of log(cd/m²) in the background field. Bars denote ± 1 SE (standard error of the mean) except for Flash Off, where only +1 SE is shown. Solid black line indicates the Weber prediction and the gray line indicates the square root prediction.