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. Author manuscript; available in PMC: 2019 Mar 7.
Published in final edited form as: Behav Processes. 2016 Dec 8;135:132–144. doi: 10.1016/j.beproc.2016.12.004

Fig. 4.

Fig. 4

Stimuli used in the final phase of the brightness discrimination (top). Labels on the squares indicate actual RGB values used in the experiment. The difficulty level 1 stimuli were 64 RGB brighter or darker than the target