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. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: J Biol Rhythms. 2009 Oct;24(5):391–402. doi: 10.1177/0748730409343767

Table 1.

Summary of the proportion of ipRGCs responding as a function of light intensity and circadian phase

Retinas ipRGCs % ipRGCs responding
−2 log I −3 log I −3.5 log I −4 log I
early day 9 35 100 97 69 17
midday 11 33 100 97 58 30
early night 10 34 100 91 74 24
midnight 11 35 100 100 60 23