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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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(A) Schematic of the stimulus. The large circular patch containing the test disk is a uniform background field of light that defines adapting level. The four small dim spots (0.03°) guide subject’s attention to the test target location. For the rod experiments, the subjects were instructed to fixate at the fixation spot located along the edge of the background disk (5° below the test target). For the cone experiment, the subjects were fixating at the test target. (B) Timeline of the test target and background field presentations. The background field appears continuously (Ton), disappears temporarily (Toff), or flashes (Toff-flash). The test target flashed for 200 ms, as shown, or flickered for 2 s (not shown).