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. Author manuscript; available in PMC: 2017 Feb 28.
Published in final edited form as: J Opt Soc Am A Opt Image Sci Vis. 2016 Mar;33(3):A104–A122. doi: 10.1364/JOSAA.33.00A104

Fig. 11.

Fig. 11

Impulse response functions showing relative response as a function of time for putative S-cone ON and OFF channels of a younger and older observer. Blue and yellow show responses to S-cone increments and decrements, respectively. From [142].